[Search] [Playground] Semantic text support (elastic#186268)

## Summary

This adds semantic_text support to Chat playground. 

- We detect the presence of semantic_text and favour these fields over
any other ones.
- We do a nested query if the field is a semantic_text type, and use the
inner_hits to populate the context
- This was manually tested through the QA scenarios list and I added a
couple more scenarios for semantic_text.
- Added to telemetry key with `_SEMANTIC` entry

Coverage is still units but this change is pretty well covered. FTRs
will follow once we have basic "full chat" flow.

### Checklist

Delete any items that are not applicable to this PR.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [ ] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [ ] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

---------

Co-authored-by: Kibana Machine <[email protected]>

x-pack/plugins/search_playground/__mocks__/fetch_query_source_fields.mock.ts

@@ -5,7 +5,177 @@
  * 2.0.
  */
 
-import { SearchResponse } from '@elastic/elasticsearch/lib/api/types';
+import { IndicesGetMappingResponse, SearchResponse } from '@elastic/elasticsearch/lib/api/types';
+
+export const SPARSE_SEMANTIC_FIELD_FIELD_CAPS = {
+  indices: ['test-index2'],
+  fields: {
+    infer_field: {
+      semantic_text: {
+        type: 'semantic_text',
+        metadata_field: false,
+        searchable: false,
+        aggregatable: false,
+      },
+    },
+    'infer_field.inference.chunks.embeddings': {
+      sparse_vector: {
+        type: 'sparse_vector',
+        metadata_field: false,
+        searchable: true,
+        aggregatable: false,
+      },
+    },
+    non_infer_field: {
+      text: {
+        type: 'text',
+        metadata_field: false,
+        searchable: true,
+        aggregatable: false,
+      },
+    },
+    'infer_field.inference.chunks.text': {
+      keyword: {
+        type: 'keyword',
+        metadata_field: false,
+        searchable: false,
+        aggregatable: false,
+      },
+    },
+    'infer_field.inference': {
+      object: {
+        type: 'object',
+        metadata_field: false,
+        searchable: false,
+        aggregatable: false,
+      },
+    },
+    'infer_field.inference.chunks': {
+      nested: {
+        type: 'nested',
+        metadata_field: false,
+        searchable: false,
+        aggregatable: false,
+      },
+    },
+  },
+};
+
+export const SPARSE_SEMANTIC_FIELD_MAPPINGS = {
+  'test-index2': {
+    mappings: {
+      properties: {
+        infer_field: {
+          type: 'semantic_text',
+          inference_id: 'elser-endpoint',
+          model_settings: {
+            task_type: 'sparse_embedding',
+          },
+        },
+        non_infer_field: {
+          type: 'text',
+        },
+      },
+    },
+  },
+} as any as IndicesGetMappingResponse;
+
+export const DENSE_SEMANTIC_FIELD_MAPPINGS = {
+  'test-index2': {
+    mappings: {
+      properties: {
+        infer_field: {
+          type: 'semantic_text',
+          inference_id: 'cohere',
+          model_settings: {
+            task_type: 'text_embedding',
+            dimensions: 1536,
+            similarity: 'dot_product',
+          },
+        },
+        non_infer_field: {
+          type: 'text',
+        },
+      },
+    },
+  },
+} as any as IndicesGetMappingResponse;
+
+// for when semantic_text field hasn't been mapped with task_type
+// when theres no data / no inference has been performed in the field
+export const DENSE_SEMANTIC_FIELD_MAPPINGS_MISSING_TASK_TYPE = {
+  'test-index2': {
+    mappings: {
+      properties: {
+        infer_field: {
+          type: 'semantic_text',
+          inference_id: 'cohere',
+          model_settings: {
+            dimensions: 1536,
+            similarity: 'dot_product',
+          },
+        },
+        non_infer_field: {
+          type: 'text',
+        },
+      },
+    },
+  },
+} as any as IndicesGetMappingResponse;
+
+export const DENSE_SEMANTIC_FIELD_FIELD_CAPS = {
+  indices: ['test-index2'],
+  fields: {
+    infer_field: {
+      semantic_text: {
+        type: 'semantic_text',
+        metadata_field: false,
+        searchable: false,
+        aggregatable: false,
+      },
+    },
+    'infer_field.inference.chunks.embeddings': {
+      sparse_vector: {
+        type: 'dense_vector',
+        metadata_field: false,
+        searchable: true,
+        aggregatable: false,
+      },
+    },
+    non_infer_field: {
+      text: {
+        type: 'text',
+        metadata_field: false,
+        searchable: true,
+        aggregatable: false,
+      },
+    },
+    'infer_field.inference.chunks.text': {
+      keyword: {
+        type: 'keyword',
+        metadata_field: false,
+        searchable: false,
+        aggregatable: false,
+      },
+    },
+    'infer_field.inference': {
+      object: {
+        type: 'object',
+        metadata_field: false,
+        searchable: false,
+        aggregatable: false,
+      },
+    },
+    'infer_field.inference.chunks': {
+      nested: {
+        type: 'nested',
+        metadata_field: false,
+        searchable: false,
+        aggregatable: false,
+      },
+    },
+  },
+};
 
 export const DENSE_SPARSE_SAME_FIELD_NAME_CAPS = {
   indices: ['cohere-embeddings', 'elser_index'],

x-pack/plugins/search_playground/common/types.ts

@@ -7,18 +7,25 @@
 
 export type IndicesQuerySourceFields = Record<string, QuerySourceFields>;
 
-interface ModelFields {
+interface ModelField {
   field: string;
   model_id: string;
-  nested: boolean;
+  indices: string[];
+}
+
+interface SemanticField {
+  field: string;
+  inferenceId: string;
+  embeddingType: 'sparse_vector' | 'dense_vector';
   indices: string[];
 }
 
 export interface QuerySourceFields {
-  elser_query_fields: ModelFields[];
-  dense_vector_query_fields: ModelFields[];
+  elser_query_fields: ModelField[];
+  dense_vector_query_fields: ModelField[];
   bm25_query_fields: string[];
   source_fields: string[];
+  semantic_fields: SemanticField[];
   skipped_fields: number;
 }
 

x-pack/plugins/search_playground/public/components/edit_context/edit_context_flyout.test.tsx

@@ -19,12 +19,14 @@ jest.mock('../../hooks/use_indices_fields', () => ({
         dense_vector_query_fields: [],
         bm25_query_fields: ['field1', 'field2'],
         source_fields: ['context_field1', 'context_field2'],
+        semantic_fields: [],
       },
       index2: {
         elser_query_fields: [],
         dense_vector_query_fields: [],
         bm25_query_fields: ['field1', 'field2'],
         source_fields: ['context_field1', 'context_field2'],
+        semantic_fields: [],
       },
     },
   }),

x-pack/plugins/search_playground/public/components/view_query/view_query_flyout.test.tsx

@@ -10,6 +10,7 @@ import { render, fireEvent, screen } from '@testing-library/react';
 import { ViewQueryFlyout } from './view_query_flyout';
 import { FormProvider, useForm } from 'react-hook-form';
 import { __IntlProvider as IntlProvider } from '@kbn/i18n-react';
+import { ChatFormFields } from '../../types';
 
 jest.mock('../../hooks/use_indices_fields', () => ({
   useIndicesFields: () => ({
@@ -19,12 +20,14 @@ jest.mock('../../hooks/use_indices_fields', () => ({
         dense_vector_query_fields: [],
         bm25_query_fields: ['field1', 'field2'],
         skipped_fields: 1,
+        semantic_fields: [],
       },
       index2: {
         elser_query_fields: [],
         dense_vector_query_fields: [],
         bm25_query_fields: ['field1', 'field2'],
         skipped_fields: 0,
+        semantic_fields: [],
       },
     },
   }),
@@ -41,7 +44,11 @@ jest.mock('../../hooks/use_usage_tracker', () => ({
 const MockFormProvider = ({ children }: { children: React.ReactElement }) => {
   const methods = useForm({
     values: {
-      indices: ['index1', 'index2'],
+      [ChatFormFields.indices]: ['index1', 'index2'],
+      [ChatFormFields.sourceFields]: {
+        index1: ['field1'],
+        index2: ['field1'],
+      },
     },
   });
   return <FormProvider {...methods}>{children}</FormProvider>;

x-pack/plugins/search_playground/public/components/view_query/view_query_flyout.tsx

@@ -65,6 +65,12 @@ const groupTypeQueryFields = (
       typeQueryFields += (typeQueryFields ? '_' : '') + 'SPARSE';
     }
 
+    if (
+      selectedFields.some((field) => indexFields.semantic_fields.find((f) => f.field === field))
+    ) {
+      typeQueryFields += (typeQueryFields ? '_' : '') + 'SEMANTIC';
+    }
+
     return typeQueryFields;
   });
 
@@ -76,6 +82,7 @@ export const ViewQueryFlyout: React.FC<ViewQueryFlyoutProps> = ({ onClose }) =>
   const usageTracker = useUsageTracker();
   const { getValues } = useFormContext<ChatForm>();
   const selectedIndices: string[] = getValues(ChatFormFields.indices);
+  const sourceFields = getValues(ChatFormFields.sourceFields);
   const { fields } = useIndicesFields(selectedIndices);
   const defaultFields = getDefaultQueryFields(fields);
 
@@ -111,7 +118,7 @@ export const ViewQueryFlyout: React.FC<ViewQueryFlyoutProps> = ({ onClose }) =>
 
   const saveQuery = () => {
     queryFieldsOnChange(tempQueryFields);
-    elasticsearchQueryChange(createQuery(tempQueryFields, fields));
+    elasticsearchQueryChange(createQuery(tempQueryFields, sourceFields, fields));
     onClose();
 
     const groupedQueryFields = groupTypeQueryFields(fields, tempQueryFields);
@@ -168,7 +175,7 @@ export const ViewQueryFlyout: React.FC<ViewQueryFlyoutProps> = ({ onClose }) =>
               lineNumbers
               data-test-subj="ViewElasticsearchQueryResult"
             >
-              {JSON.stringify(createQuery(tempQueryFields, fields), null, 2)}
+              {JSON.stringify(createQuery(tempQueryFields, sourceFields, fields), null, 2)}
             </EuiCodeBlock>
           </EuiFlexItem>
           <EuiFlexItem grow={3}>
@@ -198,6 +205,7 @@ export const ViewQueryFlyout: React.FC<ViewQueryFlyoutProps> = ({ onClose }) =>
                         aria-label="Select query fields"
                         data-test-subj={`queryFieldsSelectable_${index}`}
                         options={[
+                          ...group.semantic_fields,
                           ...group.elser_query_fields,
                           ...group.dense_vector_query_fields,
                           ...group.bm25_query_fields,

x-pack/plugins/search_playground/public/hooks/use_source_indices_field.ts

@@ -89,7 +89,7 @@ export const useSourceIndicesFields = () => {
         setNoFieldsIndicesWarning(null);
       }
 
-      onElasticsearchQueryChange(createQuery(defaultFields, fields));
+      onElasticsearchQueryChange(createQuery(defaultFields, defaultSourceFields, fields));
       onSourceFieldsChange(defaultSourceFields);
       usageTracker?.count(
         AnalyticsEvents.sourceFieldsLoaded,