[DOCS] Adds preview tag to the CHANGE_POINT ES|QL command in the command list. (#129247)

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

@@ -1,4 +1,4 @@
-* [`CHANGE_POINT`](../../commands/processing-commands.md#esql-change_point)
+* [preview] [`CHANGE_POINT`](../../commands/processing-commands.md#esql-change_point)
 * [`DISSECT`](../../commands/processing-commands.md#esql-dissect)
 * [`DROP`](../../commands/processing-commands.md#esql-drop)
 * [`ENRICH`](../../commands/processing-commands.md#esql-enrich)