Declare LU JOIN GA in 9.1

Author: alex-spies

docs/reference/query-languages/esql/_snippets/commands/layout/lookup-join.md

@@ -1,11 +1,8 @@
 ## `LOOKUP JOIN` [esql-lookup-join]
 
-::::{warning}
-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.
-::::
+```yaml {applies_to}
+stack: preview 9.0.0, ga 9.1.0
+```
 
 `LOOKUP JOIN` enables you to add data from another index, AKA a 'lookup'
 index, to your {{esql}} query results, simplifying data enrichment

docs/reference/query-languages/esql/_snippets/lists/processing-commands.md

@@ -6,7 +6,7 @@
 * [`GROK`](../../commands/processing-commands.md#esql-grok)
 * [`KEEP`](../../commands/processing-commands.md#esql-keep)
 * [`LIMIT`](../../commands/processing-commands.md#esql-limit)
-* [preview] [`LOOKUP JOIN`](../../commands/processing-commands.md#esql-lookup-join)
+* [`LOOKUP JOIN`](../../commands/processing-commands.md#esql-lookup-join)
 * [preview] [`MV_EXPAND`](../../commands/processing-commands.md#esql-mv_expand)
 * [`RENAME`](../../commands/processing-commands.md#esql-rename)
 * [preview] [`SAMPLE`](../../commands/processing-commands.md#esql-sample)