https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=28781 Bug ID: 28781 Summary: Elasticsearch facets may be inaccurate Change sponsored?: --- Product: Koha Version: master Hardware: All OS: All Status: NEW Severity: normal Priority: P5 - low Component: Searching - Elasticsearch Assignee: koha-bugs@lists.koha-community.org Reporter: nick@bywatersolutions.com To recreate: 1 - Set system preferences: SearchEngine: Elasticsearch FacetMaxCount: 20 displayFacetCount: Show 2 - Using koha testing docker default data search for '*' 3 - Note the author facets like Beckett, Samuel (5) Aristophanes (3) De Niese, Danielle (3) Euripides (3) Aristotle (2) 4 - Set FacetMaxCount:400 5 - Repeat search 6 - Note facets like: Beckett, Samuel (5) Stevens, W. Richard (5) Plato (4) Aristophanes (3) De Niese, Danielle (3) 7 - Some top terms are missing when FacetMaxCount is passed to ES as 'size'

From the docs: The size parameter can be set to define how many term buckets should be returned out of the overall terms list. By default, the node coordinating the search process will request each shard to provide its own top size term buckets and once all shards respond, it will reduce the results to the final list that will then be returned to the client. This means that if the number of unique terms is greater than size, the returned list is slightly off and not accurate (it could be that the term counts are slightly off and it could even be that a term that should have been in the top size buckets was not returned). https://www.elastic.co/guide/en/elasticsearch/reference/6.8/search-aggregati...

-- You are receiving this mail because: You are the assignee for the bug. You are watching all bug changes.