# MoreLikeThis change between ES 0.16 and ES 0.17 **URL:** \ **Category:** Elasticsearch\ **Created:** [August 5, 2011, 11:32am UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065 "2011-08-05T11:32:43Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![ruflin\_2](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@ruflin\_2](https://discuss.elastic.co/u/ruflin_2)\ **Post date:** [August 5, 2011, 11:32am UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/1 "2011-08-05T11:32:43Z")
Hi @juneym just made a pull request for Elastica with the MoreLikeThis query: > Now it seems like the query is running under 0.16 but does not work under 0.17. The query looks the following: - ``` [more_like_this] => Array* ``` - ``` (* ``` - ``` [fields] => Array* ``` - ``` (* ``` - ``` [0] => email* ``` - ``` [1] => content* ``` - ``` )* ``` - - - ``` [boost] => 1* ``` - ``` [like_text] => fake gmail sample* ``` - ``` [max_query_terms] => 1* ``` - ``` [percent_terms_to_match] => 0.3* ``` - ``` [min_term_freq] => 1* ``` - ``` [min_doc_freq] => 1* ``` - ``` [max_doc_freq] => * ``` - ``` [min_word_len] => 0* ``` - ``` [max_word_len] => 0* ``` - ``` [boost_terms] => 1* ``` - ``` )* ``` - - - ``` )* ``` And elasticsearch throws the following error [_2011-08-05 12:26:05,427][DEBUG][action.search.type] [Lorna Dane] [test][0], node[XC2VHqNjQsmuGCUIfVOPVA], [P], s[STARTED]: Failed to execute [org.elasticsearch.action.search.SearchRequest@58c3d9ac]_ _org.elasticsearch.search.query.QueryPhaseExecutionException: [test][0]: query[like:fake gmail sample],from[0],size[10]: Query Failed [Failed to execute main query]_ - at org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:221)\* - at org.elasticsearch.search.SearchService.executeFetchPhase(SearchService.java:295) - - at org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteFetch(SearchServiceTransportAction.java:224) - - at org.elasticsearch.action.search.type.TransportSearchQueryAndFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryAndFetchAction.java:71) - - at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:204) - - at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:191) - - at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:177) - - at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) - - at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) - - at java.lang.Thread.run(Thread.java:680)\* _Caused by: java.io.IOException: Stream closed_ Any idea what is wrong with this query? I tried to figure out what changed between ES 0.16 and 0.17, but couldn't figure out what it is. ---
**Author:** ![Vladimir\_Shkurin](https://avatars.discourse-cdn.com/v4/letter/v/94ad74/32.png) [@Vladimir\_Shkurin](https://discuss.elastic.co/u/Vladimir_Shkurin)\ **Post date:** [August 5, 2011, 3:09pm UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/2 "2011-08-05T15:09:18Z")
I also meet with this. The problem in "fields" parameter. Here's a sample query and it don't work: > But if you remove the "fields", the query works ๐Ÿ™‚ - Offtop \* Shay, I have another question about relevance. MLT function in ElasticSearch working not as good as in Solr, the problem in fields weight. I have set "boost" for the fields in the mapping, but they are ignored. Could you make that request could look like for the query\_string { "fields" : ["title^7", "tags^3", "categories^2", "description"] } ? Many thanks in advance! ---
**Author:** ![yark](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yark/32/3148_2.png) [@yark](https://discuss.elastic.co/u/yark)\ **Post date:** [August 5, 2011, 3:13pm UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/3 "2011-08-05T15:13:12Z")
There is a typo in docs. fields must be a mlt\_fields 5 ัะตั€ะฟ. 2011, ะฒ 18:09, Vladimir Shkurin ะฝะฐะฟะธัะฐะป(ะฐ): > I also meet with this. The problem in "fields" parameter. > > Here's a sample query and it don't work: > > [gist:553660 ยท GitHub](https://gist.github.com/553660) > > But if you remove the "fields", the query works ๐Ÿ™‚ > > - Offtop \* > > Shay, I have another question about relevance. MLT function in > Elasticsearch working not as good as in Solr, the problem in fields > weight. I have set "boost" for the fields in the mapping, but they are > ignored. Could you make that request could look like for the > query\_string { "fields" : ["title^7", "tags^3", "categories^2", > "description"] } ? > > Many thanks in advance! ---
**Author:** ![Vladimir\_Shkurin](https://avatars.discourse-cdn.com/v4/letter/v/94ad74/32.png) [@Vladimir\_Shkurin](https://discuss.elastic.co/u/Vladimir_Shkurin)\ **Post date:** [August 5, 2011, 3:30pm UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/4 "2011-08-05T15:30:33Z")
Yaroslav, "mlt\_fields" or "mlt\_fieldsafaf" is work, but it has no effect ๐Ÿ™‚ Because the parameter "mlt\_fields" for More Like This API, not for More Like This Query ๐Ÿ™‚ ---
**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\ **Post date:** [August 5, 2011, 8:34pm UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/5 "2011-08-05T20:34:21Z")
This looks like this bug in Lucene: [[LUCENE-3326] MoreLikeThis reuses a reader after it has already closed it - ASF JIRA](https://issues.apache.org/jira/browse/LUCENE-3326). It will be fixed in 3.4, I will see if I can workaround it for now. On Fri, Aug 5, 2011 at 6:30 PM, Vladimir Shkurin [vshkurin@gmail.com](mailto:vshkurin@gmail.com) wrote: > Yaroslav, "mlt\_fields" or "mlt\_fieldsafaf" is work, but it has no > effect ๐Ÿ™‚ Because the parameter "mlt\_fields" for More Like This API, > not for More Like This Query ๐Ÿ™‚ ---
**Author:** ![ruflin\_2](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@ruflin\_2](https://discuss.elastic.co/u/ruflin_2)\ **Post date:** [August 6, 2011, 10:40am UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/6 "2011-08-06T10:40:35Z")
It works when I rename fields to mlt\_fields. But if I understand you right, the fields can be completely skipped as they don't have any affect? This means, they probably should be removed from the docu? [http://www.elasticsearch.org/guide/reference/query-dsl/mlt-query.html](http://www.elasticsearch.org/guide/reference/query-dsl/mlt-query.html) ---
**Author:** ![Vladimir\_Shkurin](https://avatars.discourse-cdn.com/v4/letter/v/94ad74/32.png) [@Vladimir\_Shkurin](https://discuss.elastic.co/u/Vladimir_Shkurin)\ **Post date:** [August 6, 2011, 11:10am UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/7 "2011-08-06T11:10:08Z")
No need to delete anything, this section of the documentation is correct. We just have to wait when will the new release of Lucene, or maybe Shay can fix it earlier ๐Ÿ™‚ ---
**Author:** ![ruflin\_2](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@ruflin\_2](https://discuss.elastic.co/u/ruflin_2)\ **Post date:** [August 7, 2011, 9:51am UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/8 "2011-08-07T09:51:33Z")
Ok, good to know. ---
**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, 3:58am UTC](https://discuss.elastic.co/t/morelikethis-change-between-es-0-16-and-es-0-17/5065/9 "2017-07-06T03:58:01Z")