# JVM Heap usage didn't decline after clearing field data cache by clear cache API
**URL:** https://discuss.elastic.co/t/jvm-heap-usage-didnt-decline-after-clearing-field-data-cache-by-clear-cache-api/16445
**Category:** Elasticsearch
**Created:** [March 19, 2014, 2:51am UTC](https://discuss.elastic.co/t/jvm-heap-usage-didnt-decline-after-clearing-field-data-cache-by-clear-cache-api/16445 "2014-03-19T02:51:40Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Gary\_Gao](https://discuss.elastic.co/u/Gary_Gao)
#### Post date: [March 19, 2014, 2:51am UTC](https://discuss.elastic.co/t/jvm-heap-usage-didnt-decline-after-clearing-field-data-cache-by-clear-cache-api/16445/1 "2014-03-19T02:51:40Z")
Hi,
While I cleared field data cache using Clear Cache API:
$curl -XPOST
'[http://localhost:9200/\_cache/clear?field\_data=true](http://localhost:9200/_cache/clear?field_data=true)'
field data cahced size decreased, indeed, but JVM heap usage didn't
declined.
What's the reasons ?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:42am UTC](https://discuss.elastic.co/t/jvm-heap-usage-didnt-decline-after-clearing-field-data-cache-by-clear-cache-api/16445/2 "2017-07-06T01:42:20Z")