Improve behaviour for stopwords-only search

[gerritbruening]

I do not find
http://dev.faustedition.net/search?q=%22wo+ist+sie%22
when I want to navigate here:
http://dev.faustedition.net/print/faust.33#l7056

However, I find http://dev.faustedition.net/print/faust.3#l299 when I search for
http://dev.faustedition.net/search?q=%22kennst+du+den%22
so antilabic verses do not cause this problem.

[thvitt]

It works when using the StandardAnalyzer ('alle Wortformen') instead of the German analyzer. I guess phrase search fails since ist is a stopword in the GermanAnalyzer?

[gerritbruening]

Hm, I have never been involved in stopwords.

[thvitt]

Stopwords are a fixed list of very frequent words (function words etc.) that are not indexed since they would produce a large number of results that are insignificant for usual use cases of a search engine. When a query contains such a word, it is usually ignored – so a query like wer ist deutsche bundeskanzlerin is reduced to deutsche bundeskanzlerin. Unfortunately, all of the words wo, ist, and sie are stopwords for the default index configuration, so we get no results.

The alle Wortformen query doesn’t use stopwords. So solutions might be to (a) disable stopwords for the default index as well or (b) provide a hint to search using the other index in case of no results.