Item14806: Solr too much unrelated results

I got many complaints about too much unrelated results and i cannot find what i am looking for

We are running the lastet Foswiki 2.1.6 + SolrPlugin + solr-5.5.5. I tried to understand the reason behind that complaints und found text_prefix and text_suffix the most problematic one. When searching e.g for Leodolter, i don't expect leod, leodo, leodol, leodolt or leodolte in my results.

Especially the facets are not useful when you got more than 100 results, but only 5 contain the terms you searched for.

I tried to exlcude text_prefix, text_suffix at search time in solrconfig.xml, that seems to work.

  text_prefix^0.5
  text_suffix^0.5

Wildcard search seems also work, are indexed fields text_prefix and text_suffix used during wildcard search?

There is an interesting blog entry on this topic: http://blog.florian-hopf.de/2014/03/prefix-and-suffix-matches-in-solr.html

I tend to disable ngram at search time and instruct users to use wildcard if they are unsure.

-- UlrichLeodolter - 27 Dec 2018

This was fixded by using different parameters during analysis and indexing time to prevent search strings from being split up and injected into the query.

-- MichaelDaum - 31 Jan 2019

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