# Terminology Clarification

**URL:** <https://discuss.elastic.co/t/terminology-clarification/194758>\
**Category:** Elasticsearch\
**Created:** [August 11, 2019, 6:38pm UTC](https://discuss.elastic.co/t/terminology-clarification/194758 "2019-08-11T18:38:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![stanly](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stanly/32/52074_2.png) [@stanly](https://discuss.elastic.co/u/stanly)\
**Post date:** [August 11, 2019, 6:38pm UTC](https://discuss.elastic.co/t/terminology-clarification/194758/1 "2019-08-11T18:38:19Z")

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I was reading this ticket, and it seems like a really exciting change: [https://github.com/apache/lucene-solr/pull/715](https://github.com/apache/lucene-solr/pull/715)

One constraint mentioned here:

- The segments must have at most one field value per document (otherwise we cannot easily  
determine the matching document IDs through a binary search).

He means DocValues I assume? You can still add other field values to the document. Otherwise, it seems relatively pointless. Would like to confirm since they are being very loose with the wording.

Thanks

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**Author:** ![wangqinghuan](https://avatars.discourse-cdn.com/v4/letter/w/d26b3c/32.png) [@wangqinghuan](https://discuss.elastic.co/u/wangqinghuan)\
**Post date:** [August 12, 2019, 5:24am UTC](https://discuss.elastic.co/t/terminology-clarification/194758/2 "2019-08-12T05:24:22Z")

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He means not more than 1 value(not multi-value ) this field, I guess.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 9, 2019, 5:24am UTC](https://discuss.elastic.co/t/terminology-clarification/194758/3 "2019-09-09T05:24:29Z")

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