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

https://github.com/elastic/elasticsearch/blob/183c32d4c39948e037a7fb44dccf31ab0d60d3c3/server/src/main/java/org/elasticsearch/search/SearchService.java#L491

strapdata/elassandra,vroyer/elassandra,vroyer/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,strapdata/elassandra