# Elastic search missing aggregation **URL:** \ **Category:** Elasticsearch\ **Created:** [December 12, 2019, 8:04am UTC](https://discuss.elastic.co/t/elastic-search-missing-aggregation/211586 "2019-12-12T08:04:02Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Bala\_Kumar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bala_kumar/32/46432_2.png) [@Bala\_Kumar](https://discuss.elastic.co/u/Bala_Kumar)\ **Post date:** [December 12, 2019, 8:04am UTC](https://discuss.elastic.co/t/elastic-search-missing-aggregation/211586/1 "2019-12-12T08:04:02Z")
I'm new to elastic search and I'm using elastic search .nest I want to do aggregation of a field..If the field is missing or null ,I want to change the field and use the value of changed field in the same aggregation.Is that possible? ---
**Author:** ![rameshkr1994](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rameshkr1994/32/59029_2.png) [@rameshkr1994](https://discuss.elastic.co/u/rameshkr1994)\ **Post date:** [December 12, 2019, 3:02pm UTC](https://discuss.elastic.co/t/elastic-search-missing-aggregation/211586/2 "2019-12-12T15:02:15Z")
Hi @Bala_Kumar. Please go through below 👎 [https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-missing-aggregation.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-missing-aggregation.html) Thanks HadoopHelp ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [January 9, 2020, 3:02pm UTC](https://discuss.elastic.co/t/elastic-search-missing-aggregation/211586/3 "2020-01-09T15:02:17Z")
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