# Percolate: Document fields concatenating; causing unexpected matches **URL:** \ **Category:** Elasticsearch\ **Created:** [January 7, 2013, 1:22am UTC](https://discuss.elastic.co/t/percolate-document-fields-concatenating-causing-unexpected-matches/10242 "2013-01-07T01:22:36Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Brett\_Anderson](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/brett_anderson/32/2555_2.png) [@Brett\_Anderson](https://discuss.elastic.co/u/Brett_Anderson)\ **Post date:** [January 7, 2013, 1:22am UTC](https://discuss.elastic.co/t/percolate-document-fields-concatenating-causing-unexpected-matches/10242/1 "2013-01-07T01:22:36Z")
This is a re-post of a bug I raised at github about a month ago[https://github.com/elasticsearch/elasticsearch/issues/2476](https://github.com/elasticsearch/elasticsearch/issues/2476), but I haven't heard back about it. To recreate the issue (against ES 0.20.0 RC1), please see this bash script: > Basically a document with field1: A and field2: B will match against a percolator for the exact phrase "A B" even though that exact phrase does not occur in either field, but only when the fields are concatenated. Just wondering if a fix for this is on any road map. Thanks. -- ---
**Author:** ![Clinton\_Gormley](https://avatars.discourse-cdn.com/v4/letter/c/50afbb/32.png) [@Clinton\_Gormley](https://discuss.elastic.co/u/Clinton_Gormley)\ **Post date:** [January 7, 2013, 11:23am UTC](https://discuss.elastic.co/t/percolate-document-fields-concatenating-causing-unexpected-matches/10242/2 "2013-01-07T11:23:35Z")
On Sun, 2013-01-06 at 17:22 -0800, Laser Jesus wrote: > This is a re-post of a bug I raised at github about a month ago, but I > haven't heard back about it. > > To recreate the issue (against ES 0.20.0 RC1), please see this bash > script: [Bash script to recreate a bug in Elastic Search whereby separate document fields are merged together to create word combinations that don't actually exist in any individual field ยท GitHub](https://gist.github.com/4263982) > > Basically a document with field1: A and field2: B will match against a > percolator for the exact phrase "A B" even though that exact phrase > does not occur in either field, but only when the fields are > concatenated. The reason for this is that the values from field1 and field2 are being concatenated and indexed in the \_all field, which is what you are querying. You have two choices: 1. query field1 and field2 separately, instead of the \_all field 2. set the position\_offset\_gap of the \_all field to (eg) 100 clint -- ---
**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, 2:57am UTC](https://discuss.elastic.co/t/percolate-document-fields-concatenating-causing-unexpected-matches/10242/3 "2017-07-06T02:57:34Z")
Closed on July 6, 2017, 2:57am UTC