[8.11] [DOCS] Update tech preview to warn against using ES|QL in prod…

…uction (#174109) (#174181)

# Backport

This will backport the following commits from `main` to `8.11`:
- [[DOCS] Update tech preview to warn against using ES|QL in production
(#174109)](#174109)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Update tech preview to warn against using ES|QL in production
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production environments.\" to the\r\nES|QL tech preview banner on
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Update tech preview to warn against using ES|QL in production
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Update tech preview to warn against using ES|QL in production
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Co-authored-by: amyjtechwriter <[email protected]>

docs/concepts/esql.asciidoc

@@ -1,7 +1,7 @@
 [[esql]]
 === {esql}
 
-preview::[]
+preview::["Do not use {esql} on production environments. This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features."]
 
 The Elasticsearch Query Language, {esql}, has been created to make exploring your data faster and easier using the **Discover** application. From version 8.11 you can try this new feature, which is enabled by default. 
 

docs/discover/try-esql.asciidoc

@@ -1,7 +1,7 @@
 [[try-esql]]
 == Try {esql}
 
-preview::[]
+preview::["Do not use {esql} on production environments. This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features."]
 
 The Elasticsearch Query Language, {esql}, makes it easier to explore your data without leaving Discover.