Anna-Maria Meriniemi 0cc25c3569
[ES] Improve search term preprocessing to include literal groups (#477)
* Extend ES term preprocessing for OR groups

Implements handling "foo"|"bar" literal OR groups in the Elasticsearch
term preprocessor. Groups can be negated with -, but don't mesh with
precedence (like plain literals).

This is a partial hack, the real solution would be to parse the entire
search terms ourselves, with AND and OR groups, negations etc. But
having that work neatly with the simple_query_string would be bit of a
hassle.

* Update help.html search tips

since search (quoting strings) has changed a bit.
2018-04-15 09:53:36 +03:00
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