# Native script, doc, fields, source - which on fits best? **URL:** \ **Category:** Elasticsearch\ **Created:** [November 19, 2013, 10:01am UTC](https://discuss.elastic.co/t/native-script-doc-fields-source-which-on-fits-best/14464 "2013-11-19T10:01:35Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Yann\_Barraud](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yann_barraud/32/1108_2.png) [@Yann\_Barraud](https://discuss.elastic.co/u/Yann_Barraud)\ **Post date:** [November 19, 2013, 10:01am UTC](https://discuss.elastic.co/t/native-script-doc-fields-source-which-on-fits-best/14464/1 "2013-11-19T10:01:35Z")
Hi, I am currently updating my entity resolution plugin. I was comparing docs based on doclookup (doc()). Seems it is wrong from a functional point of view. I have to switch, and I'm now wondering : - should I use sourceLookup (source()) or fieldsLookup (fields()) ? - if fields, how can I do (I tried, but failed) ? Any example ? [http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-scripting.html](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-scripting.html) is not cristal cleear to me. Thanks. Yann -- 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:** ![brian\_yoder](https://avatars.discourse-cdn.com/v4/letter/b/f1d935/32.png) [@brian\_yoder](https://discuss.elastic.co/u/brian_yoder)\ **Post date:** [November 19, 2013, 3:52pm UTC](https://discuss.elastic.co/t/native-script-doc-fields-source-which-on-fits-best/14464/2 "2013-11-19T15:52:50Z")
Yann, Some good documentation on mvel is here: [http://mvel.codehaus.org/MVEL%202.0%20Portal](http://mvel.codehaus.org/MVEL%202.0%20Portal) This post inspired my own example mvel script as part of a combinatorial hierarchy facet "add-on" I wrote. It shows a simple example that is glued into ES and accesses the fields that are stored by ES within \_source: [http://elasticsearch-users.115913.n3.nabble.com/facet-and-grouping-td4020055.html](http://elasticsearch-users.115913.n3.nabble.com/facet-and-grouping-td4020055.html) Hope this helps! Brian -- 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, 2:06am UTC](https://discuss.elastic.co/t/native-script-doc-fields-source-which-on-fits-best/14464/3 "2017-07-06T02:06:12Z")