Nhat Nguyen 75719ac71b Make _id terms optional in segment containing only noop (#30409) ... Previously only index and delete operations are indexed into Lucene, therefore every segment should have both _id and _version terms as these operations contain both terms. However, this is no longer guaranteed after noop is also indexed into Lucene. A segment which contains only no-ops does not have neither _id or _version because a no-op does not contain these terms. This change adds a dummy version to no-ops and makes _id terms optional in PerThreadIDVersionAndSeqNoLookup. Relates #30226		2018-05-08 13:38:40 -04:00
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src	Make _id terms optional in segment containing only noop (#30409)	2018-05-08 13:38:40 -04:00
build.gradle	Generalize BWC logic (#28505)	2018-02-09 14:55:10 -06:00