Nhat Nguyen 157b352b47 Exclude nested documents in LuceneChangesSnapshot (#51279)
LuceneChangesSnapshot can be slow if nested documents are heavily used.
Also, it estimates the number of operations to be recovered in peer
recoveries inaccurately. With this change, we prefer excluding the
nested non-root documents in a Lucene query instead.
2020-01-22 17:33:28 -05:00
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