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https://issues.apache.org/jira/browse/SOLR-13172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16753879#comment-16753879
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Dawid Weiss commented on SOLR-13172:
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I think the handler and the mlt component all use the same code underneath, so
the maintenance costs, even if they're there, are not that high. I filed an
issue a while ago to improve the handler's ability to use requests that target
multiple fields (with arbitrary length text) -- SOLR-12812. This isn't the same
as duplicating the same text against all the fields (which is currently what
the code does). I don't know if this can be simulated by MLT QP because we used
the handler for requests from code (so it's more structured than the query
parser).
If this isn't a big burden, I'd leave the handler in. Using the MLT QP for
arbitrary-length inputs seems more complex (will require some form of escaping,
for example?).
> Deprecate MoreLikeTHisHandler
> -----------------------------
>
> Key: SOLR-13172
> URL: https://issues.apache.org/jira/browse/SOLR-13172
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: MoreLikeThis
> Reporter: Alessandro Benedetti
> Priority: Major
>
> Following the discussions with [~dsmi...@mac.com]
> Currently the Lucene More Like This functionality is offered in Apache Solr
> through :
> * More Like This Handler
> * More Like This Component
> * More Like This Query Parser
> The query parser is the most flexible approach and it is well supported, it
> is a good candidate to become the main entry point if a user wnat the MLT
> functionality.
> The More Like This component is quite coupled with the others but it has a
> sense and offers slightly different features from the query parser ( *Using
> MoreLikeThis as a search component returns similar documents for each
> document in the response set.*)
> So the proposal here is to deprecate and remove the More Like This Handler,
> to ease the maintenance of the functionality and to simplify the way new
> users approach it.
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