tflobbe commented on a change in pull request #1602:
URL: https://github.com/apache/lucene-solr/pull/1602#discussion_r466561784



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File path: solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java
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@@ -87,6 +100,7 @@ private SolrIndexConfig(SolrConfig solrConfig) {
     maxBufferedDocs = -1;
     ramBufferSizeMB = 100;
     ramPerThreadHardLimitMB = -1;
+    maxCommitMergeWaitMillis = -1;

Review comment:
       I don't think that's a good idea. "-1" from the Solr perspective means 
"don't set the value".  If someone has a custom merge policy where they have a 
different value set by code, we would be changing it to 
`org.apache.lucene.index.IndexWriterConfig#DEFAULT_MAX_COMMIT_MERGE_WAIT_MILLIS`
 without them having set anything on `solrconfig.xml`. 
   > In the future, this constant might change, and that's good.
   
   That's fine, since we aren't calling `iwc.setMaxCommitMergeWaitMillis(...)` 
in the default case, we'll be taking the new default for all cores where no 
alternative configuration has been provided.




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