# Elastic 8.17 and \_source

**URL:** <https://discuss.elastic.co/t/elastic-8-17-and-source/372181>\
**Category:** Elasticsearch\
**Created:** [December 18, 2024, 7:37pm UTC](https://discuss.elastic.co/t/elastic-8-17-and-source/372181 "2024-12-18T19:37:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![elasticforme](https://avatars.discourse-cdn.com/v4/letter/e/f05b48/32.png) [@elasticforme](https://discuss.elastic.co/u/elasticforme)\
**Post date:** [December 18, 2024, 7:37pm UTC](https://discuss.elastic.co/t/elastic-8-17-and-source/372181/1 "2024-12-18T19:37:29Z")

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I was reading through 8.17.0 release note. first thing it says \_source is no longer available without subscription.

is this means if you create index it won't have \_source and this means not able to update, update\_by\_query and reindex? is my understanding correct?

[https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.17.0.html](https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.17.0.html)

[https://www.elastic.co/guide/en/elasticsearch/reference/8.17/mapping-source-field.html#synthetic-source](https://www.elastic.co/guide/en/elasticsearch/reference/8.17/mapping-source-field.html#synthetic-source)

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<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [December 18, 2024, 8:15pm UTC](https://discuss.elastic.co/t/elastic-8-17-and-source/372181/2 "2024-12-18T20:15:23Z")

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It's synthetic source, not the `_source` field itself. So you can still reindex, update by query, etc...

But if you are using explicitly this `"mode": "synthetic"` in your mapping, then there's a modification. If you are not, there is no change.

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<div class="post-metadata">

**Author:** ![elasticforme](https://avatars.discourse-cdn.com/v4/letter/e/f05b48/32.png) [@elasticforme](https://discuss.elastic.co/u/elasticforme)\
**Post date:** [December 19, 2024, 1:13pm UTC](https://discuss.elastic.co/t/elastic-8-17-and-source/372181/3 "2024-12-19T13:13:20Z")

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ok, great I check few template that I have setup. and none of them has this mode. 😮‍💨