0232cc4ea1
ChangeBatchIndexer submits new tasks to an executor, so each task needs its own ReviewDb connection. Ignore Lucene's exception on double-closing an IndexWriter. Try to double-close less by not closing a search index when it may still be written to, but this is still racy. Change-Id: I6ee2863a1fbfc93904d0f2cdd45901d90696267b