# P-C Relationship using DocValues instead of Field Data Cache

**URL:** <https://discuss.elastic.co/t/p-c-relationship-using-docvalues-instead-of-field-data-cache/20597>\
**Category:** Elasticsearch\
**Created:** [November 6, 2014, 8:57am UTC](https://discuss.elastic.co/t/p-c-relationship-using-docvalues-instead-of-field-data-cache/20597 "2014-11-06T08:57:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ElasticSearch\_Users\_](https://avatars.discourse-cdn.com/v4/letter/e/b4bc9f/32.png) [@ElasticSearch\_Users\_](https://discuss.elastic.co/u/ElasticSearch_Users_)\
**Post date:** [November 6, 2014, 8:57am UTC](https://discuss.elastic.co/t/p-c-relationship-using-docvalues-instead-of-field-data-cache/20597/1 "2014-11-06T08:57:47Z")

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Hi,

From the link here, on P-C relationships, given is the excerpt shown below.

[http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/parent-child.html](http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/parent-child.html)

memory vs doc values

At the time of going to press, the parent-child ID map is held in memory as  
part offielddata  
[http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/fielddata.html](http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/fielddata.html).  
There are plans afoot to change the default setting to use doc values  
[http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/doc-values.html](http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/doc-values.html) by  
default instead.

How can we track whether this is still on and being worked on as part of a  
future release?

Thanks,  
Sandeep

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 12:51am UTC](https://discuss.elastic.co/t/p-c-relationship-using-docvalues-instead-of-field-data-cache/20597/2 "2017-07-06T00:51:54Z")

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