# Meta engine vs sub-engine tuning

**URL:** <https://discuss.elastic.co/t/meta-engine-vs-sub-engine-tuning/317561>\
**Category:** Elastic Search\
**Tags:** elastic-app-search\
**Created:** [October 26, 2022, 9:46pm UTC](https://discuss.elastic.co/t/meta-engine-vs-sub-engine-tuning/317561 "2022-10-26T21:46:32Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![nottocc](https://avatars.discourse-cdn.com/v4/letter/n/7cd45c/32.png) [@nottocc](https://discuss.elastic.co/u/nottocc)\
**Post date:** [October 26, 2022, 9:46pm UTC](https://discuss.elastic.co/t/meta-engine-vs-sub-engine-tuning/317561/1 "2022-10-26T21:46:32Z")

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Does anyone have more information on how tuning works between Meta engines and sub-engines? I'd like to find a way to weight sub-engine A more than sub-engine B. How have others approached this?

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**Author:** ![Sean\_Story](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sean_story/32/69987_2.png) [@Sean\_Story](https://discuss.elastic.co/u/Sean_Story)\
**Post date:** [October 31, 2022, 7:22pm UTC](https://discuss.elastic.co/t/meta-engine-vs-sub-engine-tuning/317561/2 "2022-10-31T19:22:18Z")

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Hi @nottocc ,

The most common way we've seen folks address this is to add a field to both sub engines like `source_engine` that you can set a boost on from your meta engine.

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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:** [November 28, 2022, 7:22pm UTC](https://discuss.elastic.co/t/meta-engine-vs-sub-engine-tuning/317561/3 "2022-11-28T19:22:57Z")

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