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https://issues.apache.org/jira/browse/SOLR-5351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365298#comment-16365298
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Dawid Weiss commented on SOLR-5351:
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My plan is to apply the stream (reader) to all fields expressed in mlt.fl. If
there is one field, nothing changes. If multiple fields are provided, we have
to buffer the reader and then pass the buffer's content to all requested
fields, effectively extracting terms of interest. Some care must be taken to
apply boosting properly (I'd create a parent Boolean query with sub-clauses for
each field, they can preserve all their parameters: min matches, field-boosts,
etc.).
> More Like This Handler uses only first field in mlt.fl when using stream.body
> -----------------------------------------------------------------------------
>
> Key: SOLR-5351
> URL: https://issues.apache.org/jira/browse/SOLR-5351
> Project: Solr
> Issue Type: Bug
> Components: MoreLikeThis
> Affects Versions: 4.4
> Environment: Linux,Windows
> Reporter: Zygmunt Wiercioch
> Assignee: Tommaso Teofili
> Priority: Minor
>
> The documentation at: http://wiki.apache.org/solr/MoreLikeThisHandler
> indicates that one can use multiple fields for similarity in mlt.fl:
> http://localhost:8983/solr/mlt?stream.body=electronics%20memory&mlt.fl=manu,cat&mlt.interestingTerms=list&mlt.mintf=0
> In trying this, only one field is used.
> Looking at the code, it only looks at the firs field:
> public DocListAndSet getMoreLikeThis( Reader reader, int start, int rows,
> List<Query> filters, List<InterestingTerm> terms, int flags ) throws
> IOException
> {
> // analyzing with the first field: previous (stupid) behavior
> rawMLTQuery = mlt.like(reader, mlt.getFieldNames()[0]);
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