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https://issues.apache.org/jira/browse/SOLR-2724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13293054#comment-13293054
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David Smiley commented on SOLR-2724:
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Bernd:
Support for a default search field name still exists mostly for compatibility,
and in perhaps some peoples' views as a matter of preference. It wasn't
actually required before its deprecation. I thought it was only the fallback
for parsing a lucene query but you indeed point out dismax has it as a fallback
for 'qf', and it's used by the highligher as a fallback for 'hl.fl' although
it appears the highlighter consults 'df' too. The main point behind its
deprecation is that I think you should be explicit in a request which field(s)
apply to what query strings or other features because the schema (schema.xml)
can't know. The same applies to the default query operator which is even more
of an odd duck sitting in schema.xml.
Bernd, simply define "qf" in your request handler definition to make Solr
respond correctly to the same queries you had before. Arguably, Dismax/Edismax
should consult "df" as a default when "qf" isn't specified. I created
SOLR-3534 for this issue.
> Deprecate defaultSearchField and defaultOperator defined in schema.xml
> ----------------------------------------------------------------------
>
> Key: SOLR-2724
> URL: https://issues.apache.org/jira/browse/SOLR-2724
> Project: Solr
> Issue Type: Improvement
> Components: Schema and Analysis, search
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Fix For: 3.6, 4.0
>
> Attachments:
> SOLR-2724_deprecateDefaultSearchField_and_defaultOperator.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> I've always been surprised to see the <defaultSearchField> element and
> <solrQueryParser defaultOperator="OR"/> defined in the schema.xml file since
> the first time I saw them. They just seem out of place to me since they are
> more query parser related than schema related. But not only are they
> misplaced, I feel they shouldn't exist. For query parsers, we already have a
> "df" parameter that works just fine, and explicit field references. And the
> default lucene query operator should stay at OR -- if a particular query
> wants different behavior then use q.op or simply use "OR".
> <similarity> Seems like something better placed in solrconfig.xml than in the
> schema.
> In my opinion, defaultSearchField and defaultOperator configuration elements
> should be deprecated in Solr 3.x and removed in Solr 4. And <similarity>
> should move to solrconfig.xml. I am willing to do it, provided there is
> consensus on it of course.
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