# Elasticsearch field cache always filled up and prevents other query to run
**URL:** https://discuss.elastic.co/t/elasticsearch-field-cache-always-filled-up-and-prevents-other-query-to-run/17162
**Category:** Elasticsearch
**Created:** [April 24, 2014, 1:42am UTC](https://discuss.elastic.co/t/elasticsearch-field-cache-always-filled-up-and-prevents-other-query-to-run/17162 "2014-04-24T01:42:24Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Olivier\_B](https://discuss.elastic.co/u/Olivier_B)
#### Post date: [April 24, 2014, 1:42am UTC](https://discuss.elastic.co/t/elasticsearch-field-cache-always-filled-up-and-prevents-other-query-to-run/17162/1 "2014-04-24T01:42:24Z")
Hi all,
I set up an index containing 500.000 with million nested documents and I
run big queries with a lot of aggregation. As expected this is using a LOT
of memory and I easily have an OutOfMemory exception if a user perform a
query for too many documents
So I configured elasticsearch with the folloting:
indices.fielddata.cache.size: 20%
indices.fielddata.breaker.limit: 20%
indices.fielddata.breaker.overhead: 1.2
indices.fielddata.cache.expiry: 1m
indices.cache.filter.size: 20%
indices.cache.filter.expire: 1m
(I've two nodes with one index running on m3.xlarge EC2 instances with 5
shards per node HEAP size is 8G (half of total RAM)).
Now I've well this beautiful error message when a user is performing a big
query:
CircuitBreakingException[Data too large, data would be larger than limit of
[2570007347] bytes
If I check the nodes, the field cache reached its maximum size (1.6G) as
expected. Then I can easily returned an error message to the user telling
him to downsize the scope of its query and it should be fine.
But... This will never let me run a query anymore!
The cache is filled up for ever and all query, even basic small search
(without aggregation) will be responded with the CircuitBreakingException.
The only way I found so far is manually clearing the cache. Of course this
is not an acceptable solution for production.
\*How can I make sure this cache will never be continuously filled up? \*
How can I automatically remove from the cache unused data?
Does indices.fielddata.cache.expiry config param actually work?
Thanks all!
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:33am UTC](https://discuss.elastic.co/t/elasticsearch-field-cache-always-filled-up-and-prevents-other-query-to-run/17162/2 "2017-07-06T01:33:53Z")