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document the search context is freed if the scroll is not extended (#34739) 

The `fetchPhaseShouldFreeContext` returns true when there is a scroll context but the scroll parameter is null, thus freeing the search context.

183c32d4c3/server/src/main/java/org/elasticsearch/search/SearchService.java (L491)
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Stéphane Campinas 2018-10-25 22:48:06 +02:00 committed by Nik Everett
parent 59df6e8689
commit 27c4d63340
1 changed files with 3 additions and 1 deletions
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docs/reference/search/request/scroll.asciidoc
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@ -109,7 +109,9 @@ request) tells Elasticsearch how long it should keep the search context alive.
Its value (e.g. `1m`, see <<time-units>>) does not need to be long enough to
process all data -- it just needs to be long enough to process the previous
batch of results. Each `scroll` request (with the `scroll` parameter) sets a
new expiry time.
new expiry time. If a `scroll` request doesn't pass in the `scroll`
parameter, then the search context will be freed as part of _that_ `scroll`
request.
Normally, the background merge process optimizes the
index by merging together smaller segments to create new bigger segments, at