C:\workspaces\workspaceecm5\LuceneIndexUpgrade\lb>java -cp 
lucene-core-6.6.6.jar;lucene-backward-codecs-6.6.6.jar 
org.apache.lucene.index.IndexUpgrader -delete-prior-commits -verbose 
"V:\\LuceneMigration\\5"
IFD 0 [2022-01-12T14:02:35.479Z; main]: init: current segments file is 
"segments_8z"; 
deletionPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy@6833ce2c
IFD 0 [2022-01-12T14:02:35.491Z; main]: init: load commit "segments_8z"
IFD 0 [2022-01-12T14:02:35.494Z; main]: delete []
IFD 0 [2022-01-12T14:02:35.495Z; main]: now checkpoint "_gg(5.5.5):C98089 
_gu(5.5.5):C52875 _h4(5.5.5):c11834" [3 segments ; isCommit = false]
IFD 0 [2022-01-12T14:02:35.495Z; main]: delete []
IFD 0 [2022-01-12T14:02:35.496Z; main]: 1 msec to checkpoint
IW 0 [2022-01-12T14:02:35.496Z; main]: init: create=false
IW 0 [2022-01-12T14:02:35.498Z; main]:
dir=MMapDirectory@V:\LuceneMigration\5 
lockFactory=org.apache.lucene.store.NativeFSLockFactory@7d417077
index=_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834
version=6.6.6
analyzer=null
ramBufferSizeMB=16.0
maxBufferedDocs=-1
maxBufferedDeleteTerms=-1
mergedSegmentWarmer=null
delPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy
commit=null
openMode=CREATE_OR_APPEND
similarity=org.apache.lucene.search.similarities.BM25Similarity
mergeScheduler=ConcurrentMergeScheduler: maxThreadCount=-1, maxMergeCount=-1, 
ioThrottle=true
codec=Lucene62
infoStream=org.apache.lucene.util.PrintStreamInfoStream
mergePolicy=UpgradeIndexMergePolicy([TieredMergePolicy: maxMergeAtOnce=10, 
maxMergeAtOnceExplicit=30, maxMergedSegmentMB=5120.0, floorSegmentMB=2.0, 
forceMergeDeletesPctAllowed=10.0, segmentsPerTier=10.0, 
maxCFSSegmentSizeMB=8.796093022207999E12, noCFSRatio=0.1)
indexerThreadPool=org.apache.lucene.index.DocumentsWriterPerThreadPool@7dc36524
readerPooling=false
perThreadHardLimitMB=1945
useCompoundFile=true
commitOnClose=true
indexSort=null
writer=org.apache.lucene.index.IndexWriter@35bbe5e8

IW 0 [2022-01-12T14:02:35.499Z; main]: MMapDirectory.UNMAP_SUPPORTED=true
IndexUpgrader 0 [2022-01-12T14:02:35.499Z; main]: Upgrading all pre-6.6.6 
segments of index directory 'MMapDirectory@V:\LuceneMigration\5 
lockFactory=org.apache.lucene.store.NativeFSLockFactory@7d417077' to version 
6.6.6...
IW 0 [2022-01-12T14:02:35.500Z; main]: forceMerge: index now _gg(5.5.5):C98089 
_gu(5.5.5):C52875 _h4(5.5.5):c11834
IW 0 [2022-01-12T14:02:35.501Z; main]: now flush at forceMerge
IW 0 [2022-01-12T14:02:35.501Z; main]:   start flush: applyAllDeletes=true
IW 0 [2022-01-12T14:02:35.502Z; main]:   index before flush _gg(5.5.5):C98089 
_gu(5.5.5):C52875 _h4(5.5.5):c11834
DW 0 [2022-01-12T14:02:35.502Z; main]: startFullFlush
DW 0 [2022-01-12T14:02:35.503Z; main]: main finishFullFlush success=true
IW 0 [2022-01-12T14:02:35.503Z; main]: apply all deletes during flush
IW 0 [2022-01-12T14:02:35.503Z; main]: now apply all deletes for all segments 
maxDoc=162798
BD 0 [2022-01-12T14:02:35.509Z; main]: applyDeletes: open segment readers took 
0 msec
BD 0 [2022-01-12T14:02:35.510Z; main]: applyDeletes: no segments; skipping
BD 0 [2022-01-12T14:02:35.510Z; main]: prune sis=segments_8z: _gg(5.5.5):C98089 
_gu(5.5.5):C52875 _h4(5.5.5):c11834 minGen=0 packetCount=0
UPGMP 0 [2022-01-12T14:02:35.511Z; main]: findForcedMerges: 
segmentsToUpgrade={_gg(5.5.5):C98089=true, _gu(5.5.5):C52875=true, 
_h4(5.5.5):c11834=true}
TMP 0 [2022-01-12T14:02:35.511Z; main]: findForcedMerges maxSegmentCount=1 
infos=_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834 
segmentsToMerge={_gg(5.5.5):C98089=true, _gu(5.5.5):C52875=true, 
_h4(5.5.5):c11834=true}
TMP 0 [2022-01-12T14:02:35.514Z; main]: eligible=[_gg(5.5.5):C98089, 
_gu(5.5.5):C52875, _h4(5.5.5):c11834]
TMP 0 [2022-01-12T14:02:35.514Z; main]: forceMergeRunning=false
TMP 0 [2022-01-12T14:02:35.516Z; main]: add final merge=_gg(5.5.5):C98089 
_gu(5.5.5):C52875 _h4(5.5.5):c11834
IW 0 [2022-01-12T14:02:35.517Z; main]: add merge to pendingMerges: 
_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834 [total 1 pending]
IW 0 [2022-01-12T14:02:35.517Z; main]: registerMerge merging= []
IW 0 [2022-01-12T14:02:35.518Z; main]: registerMerge info=_gg(5.5.5):C98089
IW 0 [2022-01-12T14:02:35.518Z; main]: registerMerge info=_gu(5.5.5):C52875
IW 0 [2022-01-12T14:02:35.519Z; main]: registerMerge info=_h4(5.5.5):c11834
MS 0 [2022-01-12T14:02:35.520Z; main]: initDynamicDefaults spins=true 
maxThreadCount=1 maxMergeCount=6
MS 0 [2022-01-12T14:02:35.522Z; main]: now merge
MS 0 [2022-01-12T14:02:35.522Z; main]:   index: _gg(5.5.5):C98089 
_gu(5.5.5):C52875 _h4(5.5.5):c11834
MS 0 [2022-01-12T14:02:35.522Z; main]:   consider merge _gg(5.5.5):C98089 
_gu(5.5.5):C52875 _h4(5.5.5):c11834
MS 0 [2022-01-12T14:02:35.523Z; main]:     launch new thread [Lucene Merge 
Thread #0]
MS 0 [2022-01-12T14:02:35.524Z; Lucene Merge Thread #0]:   merge thread: start
IW 0 [2022-01-12T14:02:35.524Z; Lucene Merge Thread #0]: now apply deletes for 
3 merging segments
BD 0 [2022-01-12T14:02:35.524Z; Lucene Merge Thread #0]: applyDeletes: open 
segment readers took 0 msec
BD 0 [2022-01-12T14:02:35.524Z; Lucene Merge Thread #0]: applyDeletes: no 
segments; skipping
BD 0 [2022-01-12T14:02:35.526Z; Lucene Merge Thread #0]: prune sis=segments_8z: 
_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834 minGen=0 packetCount=0
IW 0 [2022-01-12T14:02:35.527Z; Lucene Merge Thread #0]: merge seg=_h5 
_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834
IW 0 [2022-01-12T14:02:35.527Z; Lucene Merge Thread #0]: now merge
  merge=_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834
  index=_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834
IW 0 [2022-01-12T14:02:35.529Z; Lucene Merge Thread #0]: merging 
_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834
MS 0 [2022-01-12T14:02:35.530Z; main]: updateMergeThreads ioThrottle=true 
targetMBPerSec=20.0 MB/sec
merge thread Lucene Merge Thread #0 estSize=27.5 MB (written=0.0 MB) 
runTime=0.0s (stopped=0.0s, paused=0.0s) rate=unlimited
  leave running at Infinity MB/sec
IW 0 [2022-01-12T14:02:35.609Z; Lucene Merge Thread #0]: seg=_gg(5.5.5):C98089 
no deletes
IW 0 [2022-01-12T14:02:35.654Z; Lucene Merge Thread #0]: seg=_gu(5.5.5):C52875 
no deletes
IW 0 [2022-01-12T14:02:35.658Z; Lucene Merge Thread #0]: seg=_h4(5.5.5):c11834 
no deletes
MS 0 [2022-01-12T14:02:35.658Z; main]:   no more merges pending; now return
SM 0 [2022-01-12T14:02:35.668Z; Lucene Merge Thread #0]: merge store 
matchedCount=3 vs 3
SM 0 [2022-01-12T14:02:35.734Z; Lucene Merge Thread #0]: 70 msec to merge 
stored fields [162798 docs]
SM 0 [2022-01-12T14:02:37.129Z; Lucene Merge Thread #0]: 1394 msec to merge 
postings [162798 docs]
SM 0 [2022-01-12T14:02:37.286Z; Lucene Merge Thread #0]: 156 msec to merge doc 
values [162798 docs]
SM 0 [2022-01-12T14:02:37.287Z; Lucene Merge Thread #0]: 0 msec to merge points 
[162798 docs]
SM 0 [2022-01-12T14:02:37.874Z; Lucene Merge Thread #0]: 585 msec to merge 
norms [162798 docs]
SM 0 [2022-01-12T14:02:37.877Z; Lucene Merge Thread #0]: 3 msec to write field 
infos [162798 docs]
IW 0 [2022-01-12T14:02:37.881Z; Lucene Merge Thread #0]: merge codec=Lucene62 
maxDoc=162798; merged segment has no vectors; norms; docValues; prox; freqs; no 
points; 2.2 sec to merge segment [28.78 MB, 12.97 MB/sec]
IW 0 [2022-01-12T14:02:37.883Z; Lucene Merge Thread #0]: merged segment 
size=28.782 MB vs estimate=27.451 MB
IW 0 [2022-01-12T14:02:37.883Z; Lucene Merge Thread #0]: commitMerge: 
_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834 index=_gg(5.5.5):C98089 
_gu(5.5.5):C52875 _h4(5.5.5):c11834
IW 0 [2022-01-12T14:02:37.885Z; Lucene Merge Thread #0]: commitMergeDeletes 
_gg(5.5.5):C98089 _gu(5.5.5):C52875 _h4(5.5.5):c11834
IW 0 [2022-01-12T14:02:37.887Z; Lucene Merge Thread #0]: no new deletes or 
field updates since merge started
IFD 0 [2022-01-12T14:02:37.891Z; Lucene Merge Thread #0]: now checkpoint 
"_h5(6.6.6):C162798" [1 segments ; isCommit = false]
IFD 0 [2022-01-12T14:02:37.891Z; Lucene Merge Thread #0]: delete []
IFD 0 [2022-01-12T14:02:37.891Z; Lucene Merge Thread #0]: 0 msec to checkpoint
IW 0 [2022-01-12T14:02:37.891Z; Lucene Merge Thread #0]: after commitMerge: 
_h5(6.6.6):C162798
UPGMP 0 [2022-01-12T14:02:37.892Z; Lucene Merge Thread #0]: findForcedMerges: 
segmentsToUpgrade={}
IW 0 [2022-01-12T14:02:37.892Z; Lucene Merge Thread #0]: merge time 2368 msec 
for 162798 docs
MS 0 [2022-01-12T14:02:37.893Z; Lucene Merge Thread #0]:   merge thread: done
MS 0 [2022-01-12T14:02:37.893Z; Lucene Merge Thread #0]: now merge
MS 0 [2022-01-12T14:02:37.893Z; Lucene Merge Thread #0]:   index: 
_h5(6.6.6):C162798
MS 0 [2022-01-12T14:02:37.894Z; Lucene Merge Thread #0]:   no more merges 
pending; now return
IndexUpgrader 0 [2022-01-12T14:02:37.892Z; main]: All segments upgraded to 
version 6.6.6
IndexUpgrader 0 [2022-01-12T14:02:37.894Z; main]: Enforcing commit to rewrite 
all index metadata...
MS 0 [2022-01-12T14:02:37.894Z; Lucene Merge Thread #0]: updateMergeThreads 
ioThrottle=true targetMBPerSec=20.0 MB/sec
IW 0 [2022-01-12T14:02:37.895Z; main]: commit: start
IW 0 [2022-01-12T14:02:37.895Z; main]: commit: enter lock
IW 0 [2022-01-12T14:02:37.895Z; main]: commit: now prepare
IW 0 [2022-01-12T14:02:37.896Z; main]: prepareCommit: flush
IW 0 [2022-01-12T14:02:37.896Z; main]:   index before flush _h5(6.6.6):C162798
DW 0 [2022-01-12T14:02:37.896Z; main]: startFullFlush
IW 0 [2022-01-12T14:02:37.896Z; main]: apply all deletes during flush
IW 0 [2022-01-12T14:02:37.897Z; main]: now apply all deletes for all segments 
maxDoc=162798
BD 0 [2022-01-12T14:02:37.897Z; main]: applyDeletes: open segment readers took 
0 msec
BD 0 [2022-01-12T14:02:37.897Z; main]: applyDeletes: no segments; skipping
BD 0 [2022-01-12T14:02:37.898Z; main]: prune sis=segments_8z: 
_h5(6.6.6):C162798 minGen=0 packetCount=0
DW 0 [2022-01-12T14:02:37.898Z; main]: main finishFullFlush success=true
IW 0 [2022-01-12T14:02:37.898Z; main]: startCommit(): start
IW 0 [2022-01-12T14:02:37.898Z; main]: startCommit index=_h5(6.6.6):C162798 
changeCount=4
IW 0 [2022-01-12T14:02:37.903Z; main]: startCommit: wrote pending segments file 
"pending_segments_90"
IW 0 [2022-01-12T14:02:37.942Z; main]: done all syncs: [_h5_Lucene50_0.tim, 
_h5_Lucene54_0.dvm, _h5.fdx, _h5_Lucene50_0.doc, _h5.nvd, _h5_Lucene50_0.tip, 
_h5.si, _h5.nvm, _h5.fnm, _h5_Lucene54_0.dvd, _h5.fdt, _h5_Lucene50_0.pos]
IW 0 [2022-01-12T14:02:37.942Z; main]: commit: pendingCommit != null
IW 0 [2022-01-12T14:02:37.944Z; main]: commit: done writing segments file 
"segments_90"
IFD 0 [2022-01-12T14:02:37.944Z; main]: now checkpoint "_h5(6.6.6):C162798" [1 
segments ; isCommit = true]
IFD 0 [2022-01-12T14:02:37.944Z; main]: deleteCommits: now decRef commit 
"segments_8z"
IFD 0 [2022-01-12T14:02:37.945Z; main]: delete [segments_8z, _gu.nvd, 
_gu_Lucene50_0.tim, _gg.nvm, _gg.fnm, _h4.cfe, _gu_Lucene50_0.tip, 
_gu_Lucene50_0.pos, _gg.si, _gg_Lucene50_0.tip, _gg_Lucene50_0.tim, _h4.si, 
_gg.nvd, _gg_Lucene50_0.pos, _gu_Lucene50_0.doc, _gu.fdx, _gu_Lucene54_0.dvd, 
_gu.si, _gu.fdt, _gu_Lucene54_0.dvm, _gg_Lucene54_0.dvd, _gg.fdt, 
_gg_Lucene50_0.doc, _h4.cfs, _gg_Lucene54_0.dvm, _gg.fdx, _gu.nvm, _gu.fnm]
IFD 0 [2022-01-12T14:02:37.956Z; main]: 12 msec to checkpoint
IFD 0 [2022-01-12T14:02:37.956Z; main]: delete []
IW 0 [2022-01-12T14:02:37.957Z; main]: commit: took 61.1 msec
IW 0 [2022-01-12T14:02:37.957Z; main]: commit: done
IndexUpgrader 0 [2022-01-12T14:02:37.957Z; main]: Committed upgraded metadata 
to index.
IW 0 [2022-01-12T14:02:37.957Z; main]: now flush at close
IW 0 [2022-01-12T14:02:37.958Z; main]:   start flush: applyAllDeletes=true
IW 0 [2022-01-12T14:02:37.958Z; main]:   index before flush _h5(6.6.6):C162798
DW 0 [2022-01-12T14:02:37.959Z; main]: startFullFlush
DW 0 [2022-01-12T14:02:37.959Z; main]: main finishFullFlush success=true
IW 0 [2022-01-12T14:02:37.959Z; main]: apply all deletes during flush
IW 0 [2022-01-12T14:02:37.960Z; main]: now apply all deletes for all segments 
maxDoc=162798
BD 0 [2022-01-12T14:02:37.960Z; main]: applyDeletes: open segment readers took 
0 msec
BD 0 [2022-01-12T14:02:37.960Z; main]: applyDeletes: no segments; skipping
BD 0 [2022-01-12T14:02:37.961Z; main]: prune sis=segments_90: 
_h5(6.6.6):C162798 minGen=0 packetCount=0
MS 0 [2022-01-12T14:02:37.961Z; main]: updateMergeThreads ioThrottle=true 
targetMBPerSec=10240.0 MB/sec
MS 0 [2022-01-12T14:02:37.961Z; main]: now merge
MS 0 [2022-01-12T14:02:37.963Z; main]:   index: _h5(6.6.6):C162798
MS 0 [2022-01-12T14:02:37.964Z; main]:   no more merges pending; now return
IW 0 [2022-01-12T14:02:37.964Z; main]: waitForMerges
IW 0 [2022-01-12T14:02:37.964Z; main]: waitForMerges done
IW 0 [2022-01-12T14:02:37.964Z; main]: commit: start
IW 0 [2022-01-12T14:02:37.965Z; main]: commit: enter lock
IW 0 [2022-01-12T14:02:37.965Z; main]: commit: now prepare
IW 0 [2022-01-12T14:02:37.965Z; main]: prepareCommit: flush
IW 0 [2022-01-12T14:02:37.965Z; main]:   index before flush _h5(6.6.6):C162798
DW 0 [2022-01-12T14:02:37.966Z; main]: startFullFlush
IW 0 [2022-01-12T14:02:37.966Z; main]: apply all deletes during flush
IW 0 [2022-01-12T14:02:37.966Z; main]: now apply all deletes for all segments 
maxDoc=162798
BD 0 [2022-01-12T14:02:37.967Z; main]: applyDeletes: open segment readers took 
0 msec
BD 0 [2022-01-12T14:02:37.967Z; main]: applyDeletes: no segments; skipping
BD 0 [2022-01-12T14:02:37.967Z; main]: prune sis=segments_90: 
_h5(6.6.6):C162798 minGen=0 packetCount=0
DW 0 [2022-01-12T14:02:37.967Z; main]: main finishFullFlush success=true
IW 0 [2022-01-12T14:02:37.968Z; main]: startCommit(): start
IW 0 [2022-01-12T14:02:37.968Z; main]:   skip startCommit(): no changes pending
IFD 0 [2022-01-12T14:02:37.968Z; main]: delete []
IW 0 [2022-01-12T14:02:37.969Z; main]: commit: pendingCommit == null; skip
IW 0 [2022-01-12T14:02:37.969Z; main]: commit: took 3.8 msec
IW 0 [2022-01-12T14:02:37.969Z; main]: commit: done
IW 0 [2022-01-12T14:02:37.969Z; main]: rollback
IW 0 [2022-01-12T14:02:37.970Z; main]: all running merges have aborted
IW 0 [2022-01-12T14:02:37.970Z; main]: rollback: done finish merges
DW 0 [2022-01-12T14:02:37.970Z; main]: abort
DW 0 [2022-01-12T14:02:37.971Z; main]: done abort success=true
IW 0 [2022-01-12T14:02:37.971Z; main]: rollback: infos=_h5(6.6.6):C162798
IFD 0 [2022-01-12T14:02:37.971Z; main]: now checkpoint "_h5(6.6.6):C162798" [1 
segments ; isCommit = false]
IFD 0 [2022-01-12T14:02:37.971Z; main]: delete []
IFD 0 [2022-01-12T14:02:37.972Z; main]: 0 msec to checkpoint
IFD 0 [2022-01-12T14:02:37.972Z; main]: delete []
IFD 0 [2022-01-12T14:02:37.972Z; main]: delete []

C:\workspaces\workspaceecm5\LuceneIndexUpgrade\lb>java -cp 
lucene-core-7.7.3.jar;lucene-backward-codecs-7.7.3.jar 
org.apache.lucene.index.IndexUpgrader -delete-prior-commits -verbose 
"V:\\LuceneMigration\\5"
IFD 0 [2022-01-12T14:03:35.765Z; main]: init: current segments file is 
"segments_90"; 
deletionPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy@4ec6a292
IFD 0 [2022-01-12T14:03:35.778Z; main]: init: load commit "segments_90"
IFD 0 [2022-01-12T14:03:35.785Z; main]: now checkpoint 
"_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]"
 [1 segments ; isCommit = false]
IFD 0 [2022-01-12T14:03:35.786Z; main]: 5 msec to checkpoint
IW 0 [2022-01-12T14:03:35.786Z; main]: init: create=false reader=null
IW 0 [2022-01-12T14:03:35.788Z; main]:
dir=MMapDirectory@V:\LuceneMigration\5 
lockFactory=org.apache.lucene.store.NativeFSLockFactory@3ac3fd8b
index=_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
version=7.7.3
analyzer=null
ramBufferSizeMB=16.0
maxBufferedDocs=-1
mergedSegmentWarmer=null
delPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy
commit=null
openMode=CREATE_OR_APPEND
similarity=org.apache.lucene.search.similarities.BM25Similarity
mergeScheduler=ConcurrentMergeScheduler: maxThreadCount=-1, maxMergeCount=-1, 
ioThrottle=true
codec=Lucene70
infoStream=org.apache.lucene.util.PrintStreamInfoStream
mergePolicy=UpgradeIndexMergePolicy([TieredMergePolicy: maxMergeAtOnce=10, 
maxMergeAtOnceExplicit=30, maxMergedSegmentMB=5120.0, floorSegmentMB=2.0, 
forceMergeDeletesPctAllowed=10.0, segmentsPerTier=10.0, 
maxCFSSegmentSizeMB=8.796093022207999E12, noCFSRatio=0.1, 
deletesPctAllowed=33.0)
indexerThreadPool=org.apache.lucene.index.DocumentsWriterPerThreadPool@5594a1b5
readerPooling=true
perThreadHardLimitMB=1945
useCompoundFile=true
commitOnClose=true
indexSort=null
checkPendingFlushOnUpdate=true
softDeletesField=null
writer=org.apache.lucene.index.IndexWriter@6a5fc7f7

IW 0 [2022-01-12T14:03:35.789Z; main]: MMapDirectory.UNMAP_SUPPORTED=true
IndexUpgrader 0 [2022-01-12T14:03:35.790Z; main]: Upgrading all pre-7.7.3 
segments of index directory 'MMapDirectory@V:\LuceneMigration\5 
lockFactory=org.apache.lucene.store.NativeFSLockFactory@3ac3fd8b' to version 
7.7.3...
IW 0 [2022-01-12T14:03:35.791Z; main]: forceMerge: index now 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
IW 0 [2022-01-12T14:03:35.791Z; main]: now flush at forceMerge
IW 0 [2022-01-12T14:03:35.792Z; main]:   start flush: applyAllDeletes=true
IW 0 [2022-01-12T14:03:35.792Z; main]:   index before flush 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
DW 0 [2022-01-12T14:03:35.793Z; main]: startFullFlush
DW 0 [2022-01-12T14:03:35.795Z; main]: main finishFullFlush success=true
IW 0 [2022-01-12T14:03:35.795Z; main]: now apply all deletes for all segments 
buffered updates bytesUsed=0 reader pool bytesUsed=0
BD 0 [2022-01-12T14:03:35.796Z; main]: waitApply: no deletes to apply
MP 0 [2022-01-12T14:03:35.797Z; main]: findForcedMerges: 
segmentsToUpgrade={_h5(6.6.6):C162798:[diagnostics={os=Windows 10, 
java.vendor=AdoptOpenJDK, java.version=1.8.0_282, java.vm.version=25.282-b08, 
lucene.version=6.6.6, mergeMaxNumSegments=1, os.arch=amd64, 
java.runtime.version=1.8.0_282-b08, source=merge, mergeFactor=3, 
os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]=true}
MP 0 [2022-01-12T14:03:35.801Z; main]: findForcedMerges maxSegmentCount=1 
infos=_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
 segmentsToMerge={_h5(6.6.6):C162798:[diagnostics={os=Windows 10, 
java.vendor=AdoptOpenJDK, java.version=1.8.0_282, java.vm.version=25.282-b08, 
lucene.version=6.6.6, mergeMaxNumSegments=1, os.arch=amd64, 
java.runtime.version=1.8.0_282-b08, source=merge, mergeFactor=3, 
os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]=true}
MP 0 [2022-01-12T14:03:35.803Z; main]: already merged
MP 0 [2022-01-12T14:03:35.803Z; main]: findForcedMerges: TieredMergePolicy does 
not want to merge all old segments, merge remaining ones into new segment: 
{_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]=true}
IW 0 [2022-01-12T14:03:35.806Z; main]: add merge to pendingMerges: 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
 [total 1 pending]
IW 0 [2022-01-12T14:03:35.806Z; main]: registerMerge merging= []
IW 0 [2022-01-12T14:03:35.807Z; main]: registerMerge 
info=_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
MS 0 [2022-01-12T14:03:35.808Z; main]: initDynamicDefaults spins=true 
maxThreadCount=1 maxMergeCount=6
MS 0 [2022-01-12T14:03:35.808Z; main]: now merge
MS 0 [2022-01-12T14:03:35.808Z; main]:   index: 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
MS 0 [2022-01-12T14:03:35.809Z; main]:   consider merge 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
MS 0 [2022-01-12T14:03:35.810Z; main]:     launch new thread [Lucene Merge 
Thread #0]
MS 0 [2022-01-12T14:03:35.811Z; Lucene Merge Thread #0]:   merge thread: start
BD 0 [2022-01-12T14:03:35.811Z; Lucene Merge Thread #0]: waitApplyForMerge: 0 
packets, 1 merging segments
BD 0 [2022-01-12T14:03:35.812Z; Lucene Merge Thread #0]: waitApply: no deletes 
to apply
IW 0 [2022-01-12T14:03:35.813Z; Lucene Merge Thread #0]: now apply deletes for 
1 merging segments
IW 0 [2022-01-12T14:03:35.816Z; Lucene Merge Thread #0]: merge seg=_h6 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
IW 0 [2022-01-12T14:03:35.816Z; Lucene Merge Thread #0]: now merge
  merge=_h5(6.6.6):C162798:[diagnostics={os=Windows 10, 
java.vendor=AdoptOpenJDK, java.version=1.8.0_282, java.vm.version=25.282-b08, 
lucene.version=6.6.6, mergeMaxNumSegments=1, os.arch=amd64, 
java.runtime.version=1.8.0_282-b08, source=merge, mergeFactor=3, 
os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
  index=_h5(6.6.6):C162798:[diagnostics={os=Windows 10, 
java.vendor=AdoptOpenJDK, java.version=1.8.0_282, java.vm.version=25.282-b08, 
lucene.version=6.6.6, mergeMaxNumSegments=1, os.arch=amd64, 
java.runtime.version=1.8.0_282-b08, source=merge, mergeFactor=3, 
os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
IW 0 [2022-01-12T14:03:35.818Z; Lucene Merge Thread #0]: merging 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
MS 0 [2022-01-12T14:03:35.820Z; main]: updateMergeThreads ioThrottle=true 
targetMBPerSec=20.0 MB/sec
merge thread Lucene Merge Thread #0 estSize=28.8 MB (written=0.0 MB) 
runTime=0.0s (stopped=0.0s, paused=0.0s) rate=unlimited
  leave running at Infinity MB/sec
MS 0 [2022-01-12T14:03:35.820Z; main]:   no more merges pending; now return
IW 0 [2022-01-12T14:03:35.907Z; Lucene Merge Thread #0]: 
seg=_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
 reader=_h5(6.6.6):C162798:[diagnostics={os=Windows 10, 
java.vendor=AdoptOpenJDK, java.version=1.8.0_282, java.vm.version=25.282-b08, 
lucene.version=6.6.6, mergeMaxNumSegments=1, os.arch=amd64, 
java.runtime.version=1.8.0_282-b08, source=merge, mergeFactor=3, 
os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
SM 0 [2022-01-12T14:03:35.917Z; Lucene Merge Thread #0]: merge store 
matchedCount=1 vs 1
SM 0 [2022-01-12T14:03:35.942Z; Lucene Merge Thread #0]: 28 msec to merge 
stored fields [162798 docs]
SM 0 [2022-01-12T14:03:37.243Z; Lucene Merge Thread #0]: 1301 msec to merge 
postings [162798 docs]
SM 0 [2022-01-12T14:03:37.347Z; Lucene Merge Thread #0]: 103 msec to merge doc 
values [162798 docs]
SM 0 [2022-01-12T14:03:37.347Z; Lucene Merge Thread #0]: 0 msec to merge points 
[162798 docs]
SM 0 [2022-01-12T14:03:38.100Z; Lucene Merge Thread #0]: 751 msec to merge 
norms [162798 docs]
SM 0 [2022-01-12T14:03:38.103Z; Lucene Merge Thread #0]: 2 msec to write field 
infos [162798 docs]
IW 0 [2022-01-12T14:03:38.105Z; Lucene Merge Thread #0]: merge codec=Lucene70 
maxDoc=162798; merged segment has no vectors; norms; docValues; prox; freqs; no 
points; 2.2 sec to merge segment [28.66 MB, 13.06 MB/sec]
IW 0 [2022-01-12T14:03:38.107Z; Lucene Merge Thread #0]: merged segment 
size=28.657 MB vs estimate=28.782 MB
IW 0 [2022-01-12T14:03:38.107Z; Lucene Merge Thread #0]: commitMerge: 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
 index=_h5(6.6.6):C162798:[diagnostics={os=Windows 10, 
java.vendor=AdoptOpenJDK, java.version=1.8.0_282, java.vm.version=25.282-b08, 
lucene.version=6.6.6, mergeMaxNumSegments=1, os.arch=amd64, 
java.runtime.version=1.8.0_282-b08, source=merge, mergeFactor=3, 
os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
IW 0 [2022-01-12T14:03:38.109Z; Lucene Merge Thread #0]: commitMergeDeletes 
_h5(6.6.6):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=6.6.6, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=3, os.version=10.0, 
timestamp=1641996155526}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
IW 0 [2022-01-12T14:03:38.110Z; Lucene Merge Thread #0]: 0 new deletes since 
merge started
IFD 0 [2022-01-12T14:03:38.120Z; Lucene Merge Thread #0]: now checkpoint 
"_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]"
 [1 segments ; isCommit = false]
IFD 0 [2022-01-12T14:03:38.120Z; Lucene Merge Thread #0]: 0 msec to checkpoint
IW 0 [2022-01-12T14:03:38.121Z; Lucene Merge Thread #0]: after commitMerge: 
_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
MP 0 [2022-01-12T14:03:38.122Z; Lucene Merge Thread #0]: findForcedMerges: 
segmentsToUpgrade={}
IW 0 [2022-01-12T14:03:38.122Z; Lucene Merge Thread #0]: merge time 2311 msec 
for 162798 docs
MS 0 [2022-01-12T14:03:38.123Z; Lucene Merge Thread #0]:   merge thread: done
MS 0 [2022-01-12T14:03:38.123Z; Lucene Merge Thread #0]: now merge
IndexUpgrader 0 [2022-01-12T14:03:38.122Z; main]: All segments upgraded to 
version 7.7.3
MS 0 [2022-01-12T14:03:38.124Z; Lucene Merge Thread #0]:   index: 
_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
IndexUpgrader 0 [2022-01-12T14:03:38.124Z; main]: Enforcing commit to rewrite 
all index metadata...
MS 0 [2022-01-12T14:03:38.125Z; Lucene Merge Thread #0]:   no more merges 
pending; now return
IW 0 [2022-01-12T14:03:38.126Z; main]: commit: start
MS 0 [2022-01-12T14:03:38.126Z; Lucene Merge Thread #0]: updateMergeThreads 
ioThrottle=true targetMBPerSec=20.0 MB/sec
IW 0 [2022-01-12T14:03:38.126Z; main]: commit: enter lock
IW 0 [2022-01-12T14:03:38.127Z; main]: commit: now prepare
IW 0 [2022-01-12T14:03:38.128Z; main]: prepareCommit: flush
IW 0 [2022-01-12T14:03:38.128Z; main]:   index before flush 
_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
DW 0 [2022-01-12T14:03:38.130Z; main]: startFullFlush
IW 0 [2022-01-12T14:03:38.131Z; main]: now apply all deletes for all segments 
buffered updates bytesUsed=0 reader pool bytesUsed=0
BD 0 [2022-01-12T14:03:38.132Z; main]: waitApply: no deletes to apply
DW 0 [2022-01-12T14:03:38.133Z; main]: main finishFullFlush success=true
IW 0 [2022-01-12T14:03:38.133Z; main]: startCommit(): start
IW 0 [2022-01-12T14:03:38.134Z; main]: startCommit 
index=_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
 changeCount=4
IW 0 [2022-01-12T14:03:38.140Z; main]: startCommit: wrote pending segments file 
"pending_segments_91"
IW 0 [2022-01-12T14:03:38.177Z; main]: done all syncs: [_h6_Lucene50_0.tip, 
_h6.fdt, _h6.nvm, _h6.fnm, _h6_Lucene70_0.dvm, _h6_Lucene50_0.doc, 
_h6_Lucene50_0.tim, _h6.si, _h6_Lucene50_0.pos, _h6.nvd, _h6_Lucene70_0.dvd, 
_h6.fdx]
IW 0 [2022-01-12T14:03:38.179Z; main]: commit: pendingCommit != null
IW 0 [2022-01-12T14:03:38.180Z; main]: commit: done writing segments file 
"segments_91"
IFD 0 [2022-01-12T14:03:38.180Z; main]: now checkpoint 
"_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]"
 [1 segments ; isCommit = true]
IFD 0 [2022-01-12T14:03:38.181Z; main]: deleteCommits: now decRef commit 
"segments_90"
IFD 0 [2022-01-12T14:03:38.182Z; main]: delete [_h5_Lucene54_0.dvm, _h5.nvm, 
_h5.fnm, _h5_Lucene50_0.tim, _h5.fdx, _h5_Lucene50_0.doc, _h5.nvd, 
_h5_Lucene50_0.tip, _h5.si, segments_90, _h5_Lucene54_0.dvd, _h5.fdt, 
_h5_Lucene50_0.pos]
IFD 0 [2022-01-12T14:03:38.189Z; main]: 7 msec to checkpoint
IW 0 [2022-01-12T14:03:38.189Z; main]: commit: took 60.5 msec
IW 0 [2022-01-12T14:03:38.189Z; main]: commit: done
IndexUpgrader 0 [2022-01-12T14:03:38.190Z; main]: Committed upgraded metadata 
to index.
IW 0 [2022-01-12T14:03:38.190Z; main]: now flush at close
IW 0 [2022-01-12T14:03:38.191Z; main]:   start flush: applyAllDeletes=true
IW 0 [2022-01-12T14:03:38.191Z; main]:   index before flush 
_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
DW 0 [2022-01-12T14:03:38.192Z; main]: startFullFlush
DW 0 [2022-01-12T14:03:38.193Z; main]: main finishFullFlush success=true
IW 0 [2022-01-12T14:03:38.195Z; main]: now apply all deletes for all segments 
buffered updates bytesUsed=0 reader pool bytesUsed=0
BD 0 [2022-01-12T14:03:38.195Z; main]: waitApply: no deletes to apply
MS 0 [2022-01-12T14:03:38.195Z; main]: updateMergeThreads ioThrottle=true 
targetMBPerSec=10240.0 MB/sec
MS 0 [2022-01-12T14:03:38.196Z; main]: now merge
MS 0 [2022-01-12T14:03:38.196Z; main]:   index: 
_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
MS 0 [2022-01-12T14:03:38.196Z; main]:   no more merges pending; now return
IW 0 [2022-01-12T14:03:38.197Z; main]: waitForMerges
IW 0 [2022-01-12T14:03:38.197Z; main]: waitForMerges done
IW 0 [2022-01-12T14:03:38.198Z; main]: commit: start
IW 0 [2022-01-12T14:03:38.198Z; main]: commit: enter lock
IW 0 [2022-01-12T14:03:38.199Z; main]: commit: now prepare
IW 0 [2022-01-12T14:03:38.199Z; main]: prepareCommit: flush
IW 0 [2022-01-12T14:03:38.199Z; main]:   index before flush 
_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
DW 0 [2022-01-12T14:03:38.200Z; main]: startFullFlush
IW 0 [2022-01-12T14:03:38.200Z; main]: now apply all deletes for all segments 
buffered updates bytesUsed=0 reader pool bytesUsed=0
BD 0 [2022-01-12T14:03:38.200Z; main]: waitApply: no deletes to apply
DW 0 [2022-01-12T14:03:38.201Z; main]: main finishFullFlush success=true
IW 0 [2022-01-12T14:03:38.201Z; main]: startCommit(): start
IW 0 [2022-01-12T14:03:38.201Z; main]:   skip startCommit(): no changes pending
IW 0 [2022-01-12T14:03:38.201Z; main]: commit: pendingCommit == null; skip
IW 0 [2022-01-12T14:03:38.202Z; main]: commit: took 2.9 msec
IW 0 [2022-01-12T14:03:38.202Z; main]: commit: done
IW 0 [2022-01-12T14:03:38.202Z; main]: rollback
IW 0 [2022-01-12T14:03:38.203Z; main]: all running merges have aborted
IW 0 [2022-01-12T14:03:38.203Z; main]: rollback: done finish merges
DW 0 [2022-01-12T14:03:38.203Z; main]: abort
DW 0 [2022-01-12T14:03:38.203Z; main]: done abort success=true
IW 0 [2022-01-12T14:03:38.204Z; main]: rollback: 
infos=_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]
IFD 0 [2022-01-12T14:03:38.204Z; main]: now checkpoint 
"_h6(7.7.3):C162798:[diagnostics={os=Windows 10, java.vendor=AdoptOpenJDK, 
java.version=1.8.0_282, java.vm.version=25.282-b08, lucene.version=7.7.3, 
mergeMaxNumSegments=1, os.arch=amd64, java.runtime.version=1.8.0_282-b08, 
source=merge, mergeFactor=1, os.version=10.0, 
timestamp=1641996215816}]:[attributes={Lucene50StoredFieldsFormat.mode=BEST_SPEED}]"
 [1 segments ; isCommit = false]
IFD 0 [2022-01-12T14:03:38.205Z; main]: 0 msec to checkpoint

C:\workspaces\workspaceecm5\LuceneIndexUpgrade\lb>java -cp 
lucene-core-8.11.1.jar;lucene-backward-codecs-8.11.1.jar 
org.apache.lucene.index.IndexUpgrader -delete-prior-commits -verbose 
"V:\\LuceneMigration\\5"
MS 0 [2022-01-12T14:04:24.248Z; main]: initDynamicDefaults spins=true 
maxThreadCount=1 maxMergeCount=6
IW 0 [2022-01-12T14:04:24.275Z; main]: init: hit exception on init; releasing 
write lock
Exception in thread "main" org.apache.lucene.index.IndexFormatTooOldException: 
Format version is not supported (resource 
BufferedChecksumIndexInput(MMapIndexInput(path="V:\LuceneMigration\5\segments_91"))):
 This index was initially created with Lucene 6.x while the current version is 
8.11.1 and Lucene only supports reading the current and previous major 
versions.. This version of Lucene only supports indexes created with release 
7.0 and later.
        at 
org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:322)
        at 
org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:291)
        at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1037)
        at org.apache.lucene.index.IndexUpgrader.upgrade(IndexUpgrader.java:167)
        at org.apache.lucene.index.IndexUpgrader.main(IndexUpgrader.java:78)
        Suppressed: org.apache.lucene.index.CorruptIndexException: checksum 
passed (7268b2f2). possibly transient resource issue, or a Lucene or JVM bug 
(resource=BufferedChecksumIndexInput(MMapIndexInput(path="V:\LuceneMigration\5\segments_91")))
                at 
org.apache.lucene.codecs.CodecUtil.checkFooter(CodecUtil.java:466)
                at 
org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:434)
                ... 4 more
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