[8.x] [Indx Mgmt] Enable semantic text adaptive allocations by default (

#200168) (#200747)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Indx Mgmt] Enable semantic text adaptive allocations by default
(#200168)](#200168)

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

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

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Co-authored-by: Sander Philipse <[email protected]>

x-pack/plugins/index_management/public/application/components/mappings_editor/components/document_fields/fields/create_field/semantic_text/use_semantic_text.test.ts

@@ -258,7 +258,9 @@ describe('useSemanticText', () => {
       {
         service: 'elser',
         service_settings: {
-          num_allocations: 1,
+          adaptive_allocations: {
+            enabled: true,
+          },
           num_threads: 1,
           model_id: '.elser_model_2',
         },

x-pack/plugins/index_management/public/application/components/mappings_editor/components/document_fields/fields/create_field/semantic_text/use_semantic_text.ts

@@ -85,7 +85,7 @@ export function useSemanticText(props: UseSemanticTextProps) {
         : {
             service: defaultInferenceEndpointConfig.service,
             service_settings: {
-              num_allocations: 1,
+              adaptive_allocations: { enabled: true },
               num_threads: 1,
               model_id: trainedModelId,
             },