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Optimize the computation of total hit count

Description

We currently always compute the total hit count when searching, but we could avoid that in some cases, for example when the user asks only for the hits.

Elasticsearch 7 provides the track_total_hits parameter to control that, and in Lucene we could remove the TotalHitCountCollector.

We should also look how to take advantage of the related optimization in Lucene allowing to stop the search when it's certain it cannot find any more hits. I don't recall the name of this optimization, but it was mentioned in a presentation in the Search devroom at Fosdem 2019, in the afternoon.

Environment

None

Status

Assignee

Unassigned

Reporter

Yoann Rodière

Fix versions

Priority

Major