Comment 1 for bug 1844418

I know the koha folks have an elasticsearch option too!

I haven't worked much with elasticsearch, but I've really enjoyed working with solr. It's really easy to tune queries. It also has a result grouping feature that might help out with implementing metarecord search (https://cwiki.apache.org/confluence/display/solr/FieldCollapsing). Also, "did-you-mean", sweet facets, and all that other fun stuff. CPAN has a solr library, but I haven't had a chance to kick its tires yet.