improve Index searcher efficiency #4012
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This change, or rather set of changes, purges all unnecessary
FSDirectory.open()calls from all webapp related classes, replacing the related code blocks with calls to retrieve(Super)IndexSearcherinstances (that can be used to getIndexReaderinstances). This should speed up the webapp a bit by avoiding the syscalls and I/O related to opening the index files.As for the first part of #4009 (comment) (about the
MultiReaderrelationship toIndexSearchers), I think it is not in dire need of addressing.