Search through tags with more like this query

Quang_Dung · October 16, 2013, 7:43am

Hi everyone,

I have a question regarding the more like this query Currently, I'm making
a solution to match "more like this" product based on its tags.id . I have
the _mapping of product which is something like this :

{
name(:string),
tags: [ {id(:integer}, {id(:integer)} ]
}

I have tried something like this :
elasticsearch:9200/<index_name>/product/_mlt?mlt_fields=tags.id but it
doesn't seem to work. I got the error :
{"error":"NumberFormatException[For input string: "[67773, 71354, 68265,
70599, 81670, 191917]"]","status":500}

Elasticsearch doesn't work automagically which is great. But I'm not clear
what is problem I have and what is a good way to solve this problem.

Thanks for reading.

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spinscale · October 16, 2013, 8:23am

Hey,

not sure on the top of my head, but I think, MLT queries need an analyzer,
which creates char terms - where as numeric analyzers in lucene do not.
This is the reason why MLT does not work with numbers. In your case a
workaround might be easy, by just indexing the real tagnames and search for
documents with the same tag (maybe you do not need MLT then).

If you want to know more, see

github.com/elastic/elasticsearch

Error on MoreLikeThis API with Non Stored Numeric Fields

opened 09:39AM - 27 Jun 13 UTC

closed 04:38PM - 16 Jul 13 UTC

lmenezes

>bug v1.0.0.Beta1 v0.90.3

According to the documentation: Note: In order to use the mlt feature a mlt_fie…ld needs to be either be stored, store term_vector or source needs to be enabled. But,running this: ``` curl -XPOST http://localhost:9200/foo curl -XPUT http://localhost:9200/foo/bar/_mapping -d '{ "bar": { "dynamic": "strict", "properties": { "id": { "type": "integer", "index": "not_analyzed" }, "content": { "type": "string", "analyzer": "standard" }}}}' curl -XPUT http://localhost:9200/foo/bar/1 -d '{"id":1, "content":"foo bar foo2 bar2 foo3 bar3"}' curl -XPUT http://localhost:9200/foo/bar/2 -d '{"id":2, "content":"foo3 bar3 foo4 bar4"}' curl -XGET 'http://localhost:9200/foo/bar/1/_mlt?mlt_fields=content&min_term_freq=1&min_doc_freq=1' curl -XGET 'http://localhost:9200/foo/bar/1/_mlt?min_term_freq=1&min_doc_freq=1' ``` fails(second query) with: {"error":"MapperParsingException[failed to parse [id]]; nested: ElasticSearchIllegalStateException[Field should have either a string, numeric or binary value]; ","status":400} This is basically because here(for example): https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/index/mapper/core/IntegerFieldMapper.java#L356-L360 The numeric value is not actually used unless the field is stored. Then here: https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/action/mlt/TransportMoreLikeThisAction.java#L293-L303 if you can't read it, it will just thrown an exception.

--Alex

On Wed, Oct 16, 2013 at 9:43 AM, Quang Dũng nxqd.inbox@gmail.com wrote:

Hi everyone,

I have a question regarding the more like this query Currently, I'm making
a solution to match "more like this" product based on its tags.id . I
have the _mapping of product which is something like this :

{
name(:string),
tags: [ {id(:integer}, {id(:integer)} ]
}

I have tried something like this :
elasticsearch:9200/<index_**name>/product/_mlt?mlt_fields=**tags.idhttp://tags.id/ but
it doesn't seem to work. I got the error :
{"error":"**NumberFormatException[For input string: "[67773, 71354,
68265, 70599, 81670, 191917]"]","status":500}

Elasticsearch doesn't work automagically which is great. But I'm not clear
what is problem I have and what is a good way to solve this problem.

Thanks for reading.

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