[Koha-bugs] [Bug 18969] Elasticsearch - _all field is deprecated - should use copy_to to prepare for ES6

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=18969

--- Comment #16 from David Gustafsson <glasklas at gmail.com> ---
> I don't think I actually follow you here - we still specify different analyzers
> per field, but we also construct the _all field and use that for keyword
> searching only - this is what we currently do. So we can search specific
> fields, or use the all.

My point was with regards to this line:
https://github.com/Koha-Community/Koha/blob/master/Koha/SearchEngine/Elasticsearch/QueryBuilder.pm#L93
where default_field is set to '_all', and in the patch this is changed to
'_all_fields'. If searching for some terms (without specifying specific fields
in the search string), the default_field will be used, 'all_fields' in this
case, and no field-specific analyzers will be used. If instead setting "fields"
to all relevant fields, the field-specific analyzers etc will be applied.

> The only downside is listing all the fields individually so a small cost in
> construction of queries and query size, but not terrible I would think

Yes, you are correct. The query construction overhead is insignificant, but it
will incur a slightly higher cost executing the query as multiple fields will
be queried instead of just one. But I still don't see using just one field as
an option since this would make most of the nice Elasticsearch free text search
features impossible to implement.


> Looking forward to it! :-) - have you seen bug 18316?
> https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=18316

Damn, must have missed that one. They are still slightly incompatible so
perhaps still would have needed to re-implement field boosts (as the new patch
always uses the "field" parameter with possible boosts, not just for boosted
fields).

I created a new issue for my suggestion regarding remove the "_all" field and
field boosts: https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20589

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