# Elasticseach out of memory issue **URL:** \ **Category:** Elasticsearch\ **Created:** [August 3, 2016, 2:44pm UTC](https://discuss.elastic.co/t/elasticseach-out-of-memory-issue/57118 "2016-08-03T14:44:43Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![vikas\_J](https://avatars.discourse-cdn.com/v4/letter/v/7ba0ec/32.png) [@vikas\_J](https://discuss.elastic.co/u/vikas_J)\ **Post date:** [August 3, 2016, 2:44pm UTC](https://discuss.elastic.co/t/elasticseach-out-of-memory-issue/57118/1 "2016-08-03T14:44:43Z")
I have elasticsearch 2.3.4 version installed. However i find that it goes out of memory quite often. The ES\_HEAP\_SIZE is set to 1.5gb(which is 50% of available RAM). I found out that it could be because of the setting "indices.fielddata.cache.size" which is unlimited by default. I tried changing it by adding entry "indices.fielddata.cache.size: 30%" in elasticsearch.yml. But however elasticsearch doesnt recognize the property "indices.fielddata.cache.size". I dont understand the issue. According to elasticsearch documentation this key should be recognized by elasticsearch. Any inputs why this issue? ---
**Author:** ![cbuescher](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cbuescher/32/60402_2.png) [@cbuescher](https://discuss.elastic.co/u/cbuescher)\ **Post date:** [August 3, 2016, 3:01pm UTC](https://discuss.elastic.co/t/elasticseach-out-of-memory-issue/57118/2 "2016-08-03T15:01:53Z")
What do you mean by > [@vikas\_J](#): > > elasticsearch doesnt recognize the property "indices.fielddata.cache.size" ---
**Author:** ![vikas\_J](https://avatars.discourse-cdn.com/v4/letter/v/7ba0ec/32.png) [@vikas\_J](https://discuss.elastic.co/u/vikas_J)\ **Post date:** [August 3, 2016, 3:25pm UTC](https://discuss.elastic.co/t/elasticseach-out-of-memory-issue/57118/3 "2016-08-03T15:25:41Z")
On adding indices.fielddata.cache.size: 30% in elasticsearch.yml, it throws parser exception like below: `Aug 3 14:48:33 server-001 elasticsearch: Exception in thread "main" SettingsException[Failed to load settings from [elasticsearch.yml]]; nested: ParserException[while parsing a block mapping Aug 3 14:48:33 server-001 elasticsearch: in 'reader', line 50, column 1: Aug 3 14:48:33 server-001 elasticsearch: indices.fielddata.cache.size: 30% Aug 3 14:48:33 server-001 elasticsearch: ^ Aug 3 14:48:33 server-001 elasticsearch: expected , but found BlockMappingStart Aug 3 14:48:33 server-001 elasticsearch: in 'reader', line 55, column 2: Aug 3 14:48:33 server-001 elasticsearch: network.host: localhost Aug 3 14:48:33 server-001 elasticsearch: ^ Aug 3 14:48:33 server-001 elasticsearch:]; Aug 3 14:48:33 server-001 elasticsearch: Likely root cause: while parsing a block mapping Aug 3 14:48:33 server-001 elasticsearch: in 'reader', line 50, column 1: Aug 3 14:48:33 server-001 elasticsearch: indices.fielddata.cache.size: 30%` ---
**Author:** ![cbuescher](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cbuescher/32/60402_2.png) [@cbuescher](https://discuss.elastic.co/u/cbuescher)\ **Post date:** [August 3, 2016, 3:38pm UTC](https://discuss.elastic.co/t/elasticseach-out-of-memory-issue/57118/4 "2016-08-03T15:38:46Z")
That looks like a broken config file, maybe some indentation issue? Hard to tell by just looking at the exception. I'd suggest you take a look at the config file around those lines that are showing up. ---
**Author:** ![vikas\_J](https://avatars.discourse-cdn.com/v4/letter/v/7ba0ec/32.png) [@vikas\_J](https://discuss.elastic.co/u/vikas_J)\ **Post date:** [August 3, 2016, 3:42pm UTC](https://discuss.elastic.co/t/elasticseach-out-of-memory-issue/57118/5 "2016-08-03T15:42:35Z")
Oops...stupid me..I was missing a space . Thanks ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [August 4, 2016, 6:33am UTC](https://discuss.elastic.co/t/elasticseach-out-of-memory-issue/57118/6 "2016-08-04T06:33:07Z")
WE don't usually recommend running ES with any decent amounts of data with less than 2GB of heap. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 10:30pm UTC](https://discuss.elastic.co/t/elasticseach-out-of-memory-issue/57118/7 "2017-07-05T22:30:14Z")