# Search Time Query Expansion **URL:** \ **Category:** Elasticsearch\ **Created:** [October 29, 2014, 2:44am UTC](https://discuss.elastic.co/t/search-time-query-expansion/20472 "2014-10-29T02:44:37Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Yingkai\_Gao](https://avatars.discourse-cdn.com/v4/letter/y/c68b51/32.png) [@Yingkai\_Gao](https://discuss.elastic.co/u/Yingkai_Gao)\ **Post date:** [October 29, 2014, 2:44am UTC](https://discuss.elastic.co/t/search-time-query-expansion/20472/1 "2014-10-29T02:44:37Z")
I want to implement a classic query expansion (Rocchio method for example) for ElasticSearch. Basically what I need to do is to retrieve the term vectors of the top N relevant documents given an original query, extract a list of terms based on some criteria, and finally get enriched document results with a expanded query. Surely I can do that by searching twice, but is there any better solution that I can do it _IN_ the ElasticSearch? Do you have any suggestions about where and how I can implement it? Thanks! -- 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). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/4f202647-5a2c-4be8-a731-f485589ef7ad%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/4f202647-5a2c-4be8-a731-f485589ef7ad%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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, 12:53am UTC](https://discuss.elastic.co/t/search-time-query-expansion/20472/2 "2017-07-06T00:53:17Z")