# Migrating 1000's of fields from SOLR to elastic

**URL:** <https://discuss.elastic.co/t/migrating-1000s-of-fields-from-solr-to-elastic/300379>\
**Category:** Elasticsearch\
**Tags:** ingest-pipeline\
**Created:** [March 22, 2022, 7:34pm UTC](https://discuss.elastic.co/t/migrating-1000s-of-fields-from-solr-to-elastic/300379 "2022-03-22T19:34:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jon\_Vivers](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jon_vivers/32/97562_2.png) [@Jon\_Vivers](https://discuss.elastic.co/u/Jon_Vivers)\
**Post date:** [March 22, 2022, 7:34pm UTC](https://discuss.elastic.co/t/migrating-1000s-of-fields-from-solr-to-elastic/300379/1 "2022-03-22T19:34:44Z")

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I am investigating migrating my search solution from SOLR to elastic. However the current SOLR implementation has several thousand fields which are used for aggregations. For example there could be a field 'color\_hist' which might contain the values ['red','blue','green'] and another 'size\_hist' which might contain the values ['small','medium','large']. These 3000ish fields all have the suffix '\_hist' to indicate they are aggregatable. I am trying to create pipeline to detect any field with the suffix '\_hist' and merge them in to a single field 'tags' that combines the original fieldname and value. In the above example the desired output would be tags:['color\_hist|red','color\_hist|blue','color\_hist|green','size\_hist|small','size\_hist|medium','size\_hist|large']

any suggestions?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [April 19, 2022, 7:35pm UTC](https://discuss.elastic.co/t/migrating-1000s-of-fields-from-solr-to-elastic/300379/2 "2022-04-19T19:35:11Z")

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