# MoreLikeThis and array field **URL:** \ **Category:** Elasticsearch\ **Created:** [April 26, 2013, 3:23pm UTC](https://discuss.elastic.co/t/morelikethis-and-array-field/11705 "2013-04-26T15:23:55Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![ghoumard](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ghoumard/32/44886_2.png) [@ghoumard](https://discuss.elastic.co/u/ghoumard)\ **Post date:** [April 26, 2013, 3:23pm UTC](https://discuss.elastic.co/t/morelikethis-and-array-field/11705/1 "2013-04-26T15:23:55Z")
Hi, We have a document like this in ES: { "ID":"1111", "Text":"This my text", "Concept":["concept1","concept2","concept3"] } We are trying to detect duplicate based on the field "concept", with a pattern like: if at least 85% of concept are the same, then it's a duplicate. But when using the following query, results are not good; $ curl -XGET ' [http://localhost:9200/twitter/tweet/1/\_mlt?mlt\_fields=concept&min\_doc\_freq=1](http://localhost:9200/twitter/tweet/1/_mlt?mlt_fields=concept&min_doc_freq=1)' We had to change the json format for the MLT to work like expected. (string instead of array) { "ID":"1111", "Text":"This my text", "Concept":"concept1 concept2 concept3" } Are we missing something ? Is this a bug or a design limitation ? Thanks, Gildas -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![ghoumard](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ghoumard/32/44886_2.png) [@ghoumard](https://discuss.elastic.co/u/ghoumard)\ **Post date:** [April 29, 2013, 12:57pm UTC](https://discuss.elastic.co/t/morelikethis-and-array-field/11705/2 "2013-04-29T12:57:54Z")
Up, We really like the fact of storing array and not string. Any idea someone ? Gildas On Friday, April 26, 2013 11:23:55 AM UTC-4, Gildas Houmard wrote: > Hi, > > We have a document like this in ES: > { "ID":"1111", "Text":"This my text", > "Concept":["concept1","concept2","concept3"] } > > We are trying to detect duplicate based on the field "concept", with a > pattern like: if at least 85% of concept are the same, then it's a > duplicate. > > But when using the following query, results are not good; > > $ curl -XGET ' > [http://localhost:9200/twitter/tweet/1/\_mlt?mlt\_fields=concept&min\_doc\_freq=1](http://localhost:9200/twitter/tweet/1/_mlt?mlt_fields=concept&min_doc_freq=1)' > We had to change the json format for the MLT to work like expected. > (string instead of array) > { "ID":"1111", "Text":"This my text", "Concept":"concept1 concept2 > concept3" } > > Are we missing something ? Is this a bug or a design limitation ? > > Thanks, > > Gildas -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![James\_Harrison](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/james_harrison/32/2368_2.png) [@James\_Harrison](https://discuss.elastic.co/u/James_Harrison)\ **Post date:** [April 29, 2013, 1:07pm UTC](https://discuss.elastic.co/t/morelikethis-and-array-field/11705/3 "2013-04-29T13:07:36Z")
On 29/04/13 13:57, Gildas Houmard wrote: > Up, > > We really like the fact of storing array and not string. > Any idea someone ? What's your mapping look like? I've seen this happen when the field type is inferred. I had to manually set the mapping of that type to be an array type, and then all was well. -- Cheers, James Harrison -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:39am UTC](https://discuss.elastic.co/t/morelikethis-and-array-field/11705/4 "2017-07-06T02:39:14Z")
Closed on July 6, 2017, 2:39am UTC