There is no _root_ field in the index data before the upgrade. The 8.x version will judge whether it is the same record according to _root_, so the update will become two after the upgrade. It is recommended to reindex after the upgrade.
> 2022年6月12日 00:10，YangLiu <sll...@126.com> 写道： > > > > > Thank you for your reply. > The _root_ field is defined as follows: > > > > > <fieldname="_root_"type="StrField"docValues="false"indexed="true"stored="false"/> > <fieldTypename="StrField"class="solr.StrField"sortMissingLast="true"docValues="true"/> > > > > > > At 2022-06-12 00:05:00, "戴晓彬" <xiaobin_...@foxmail.com> wrote: >> check the managed-schema to see if the _root_ field is defined. >> >>> 2022年6月11日 23:58，slly <sll...@126.com> 写道： >>> >>> Hello everyone. >>> We recently upgraded the online version from Solr 7 to 8.11, we found a >>> very strange problem. >>> >>> >>> Before upgrade, we wrote a row of data, the id is uniqueKey. >>> id=1, name=alice, age=10 >>> After upgrade, we write three rows of data and id=2 is repeated. >>> id=1, name=alice2, age=11 >>> id=2, name=nick, age=30 >>> id=2, name=nick2, age=31 >>> >>> >>> We found NumFound=2 when querying with debugQuery=true&q=id:1, and >>> NumFound=1 when querying with debugQuery=true&q=id:3 >>> >>> >>> For historical data, the default 'overwrite' is false? >>> >>> >>> >>> >>> Thanks. >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>>
