[8.x] 🌊 Streams: Set subobjects: false (elastic#203002) (elastic#203543)

# Backport

This will backport the following commits from `main` to `8.x`:
- [🌊 Streams: Set subobjects: false
(elastic#203002)](elastic#203002)

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

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

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BACKPORT-->

Co-authored-by: Joe Reuter <[email protected]>

x-pack/plugins/streams/server/lib/streams/component_templates/generate_layer.ts

@@ -36,7 +36,7 @@ export function generateLayer(
     template: {
       settings: isRoot(definition.id) ? logsSettings : {},
       mappings: {
-        subobjects: true, // TODO set to false once this works on Elasticsearch side - right now fields are not properly indexed.
+        subobjects: false,
         dynamic: false,
         properties,
       },