# Significant Terms - Memory Issues Redux
**URL:** https://discuss.elastic.co/t/significant-terms-memory-issues-redux/23139
**Category:** Elasticsearch
**Created:** [April 7, 2015, 9:33pm UTC](https://discuss.elastic.co/t/significant-terms-memory-issues-redux/23139 "2015-04-07T21:33:13Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@wedamija](https://discuss.elastic.co/u/wedamija)
#### Post date: [April 7, 2015, 9:33pm UTC](https://discuss.elastic.co/t/significant-terms-memory-issues-redux/23139/1 "2015-04-07T21:33:13Z")
In a previous discussion of Significant Terms
([Redirecting to Google Groups](https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/elasticsearch/EQ1ysXVC5TU/rloTy6ZrHusJ)),
one of the recommendations to reduce memory usage was:
Use "Doc Values" in your index mappings to hit disk instead of using es
> FieldData caches that cause the CircuitBreakingException (you are then more
> reliant on OS file-system caches for speed)
I tried this, but I think I'm missing some important step. It seems that
since significant terms needs the field to to be indexed, and we can't
index doc\_values fields. Is there some work around here that I've missed?
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [April 8, 2015, 6:44am UTC](https://discuss.elastic.co/t/significant-terms-memory-issues-redux/23139/2 "2015-04-08T06:44:28Z")
Nope, you can only doc values not analysed values.
On 8 April 2015 at 07:33, Dan Fuller [wedamija@gmail.com](mailto:wedamija@gmail.com) wrote:
> In a previous discussion of Significant Terms (
> [Redirecting to Google Groups](https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/elasticsearch/EQ1ysXVC5TU/rloTy6ZrHusJ)),
> one of the recommendations to reduce memory usage was:
>
> Use "Doc Values" in your index mappings to hit disk instead of using es
>
> > FieldData caches that cause the CircuitBreakingException (you are then more
> > reliant on OS file-system caches for speed)
>
> I tried this, but I think I'm missing some important step. It seems that
> since significant terms needs the field to to be indexed, and we can't
> index doc\_values fields. Is there some work around here that I've missed?
>
> --
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> To view this discussion on the web visit
> [https://groups.google.com/d/msgid/elasticsearch/15b36f4a-5c2b-4996-a4b1-3104d50e5626%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/15b36f4a-5c2b-4996-a4b1-3104d50e5626%40googlegroups.com)
> [https://groups.google.com/d/msgid/elasticsearch/15b36f4a-5c2b-4996-a4b1-3104d50e5626%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/15b36f4a-5c2b-4996-a4b1-3104d50e5626%40googlegroups.com?utm_medium=email&utm_source=footer)
> .
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 12:20am UTC](https://discuss.elastic.co/t/significant-terms-memory-issues-redux/23139/3 "2017-07-06T00:20:59Z")