# How do I run More Like This query in a different index with different fields?

**URL:** <https://discuss.elastic.co/t/how-do-i-run-more-like-this-query-in-a-different-index-with-different-fields/102457>\
**Category:** Elasticsearch\
**Created:** [October 2, 2017, 4:50pm UTC](https://discuss.elastic.co/t/how-do-i-run-more-like-this-query-in-a-different-index-with-different-fields/102457 "2017-10-02T16:50:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![data.dev](https://avatars.discourse-cdn.com/v4/letter/d/c89c15/32.png) [@data.dev](https://discuss.elastic.co/u/data.dev)\
**Post date:** [October 2, 2017, 4:50pm UTC](https://discuss.elastic.co/t/how-do-i-run-more-like-this-query-in-a-different-index-with-different-fields/102457/1 "2017-10-02T16:50:34Z")

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Is it possible to run a More Like This (MLT) query searching a particular index, while specifying a source document in a different index, where the source document has different fields?

I'm looking at this documentation:  
[https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-mlt-query.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-mlt-query.html)

I thought I could simply specify a different index in the GET (e.g. "[index name]/\_search"), but I am not sure how to construct the fields. The fields, as I understand it, are the fields in the source document, but its not clear how you specify the fields in the documents being searched.

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [October 6, 2017, 7:25am UTC](https://discuss.elastic.co/t/how-do-i-run-more-like-this-query-in-a-different-index-with-different-fields/102457/2 "2017-10-06T07:25:56Z")

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Not currently, though [https://github.com/elastic/elasticsearch/issues/26743](https://github.com/elastic/elasticsearch/issues/26743) might be what you are looking for (eventually).

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 3, 2017, 7:26am UTC](https://discuss.elastic.co/t/how-do-i-run-more-like-this-query-in-a-different-index-with-different-fields/102457/3 "2017-11-03T07:26:16Z")

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