[Search] Add index errors in Search Index page (#188682)

## Summary

This adds an error callout to the index pages in Search if the mappings
contain a semantic text field that references a non-existent inference
ID, or an inference ID without a model that has started.

x-pack/plugins/enterprise_search/public/applications/enterprise_search_content/components/search_index/index_error.tsx

@@ -0,0 +1,197 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { useEffect, useState } from 'react';
+
+import React from 'react';
+
+import { useActions, useValues } from 'kea';
+
+import {
+  InferenceServiceSettings,
+  MappingProperty,
+  MappingPropertyBase,
+  MappingTypeMapping,
+} from '@elastic/elasticsearch/lib/api/types';
+
+import { EuiButton, EuiCallOut } from '@elastic/eui';
+import { i18n } from '@kbn/i18n';
+
+import { LocalInferenceServiceSettings } from '@kbn/ml-trained-models-utils/src/constants/trained_models';
+
+import { KibanaLogic } from '../../../shared/kibana';
+import { mappingsWithPropsApiLogic } from '../../api/mappings/mappings_logic';
+
+export interface IndexErrorProps {
+  indexName: string;
+}
+
+interface SemanticTextProperty extends MappingPropertyBase {
+  inference_id: string;
+  type: 'semantic_text';
+}
+
+const parseMapping = (mappings: MappingTypeMapping) => {
+  const fields = mappings.properties;
+  if (!fields) {
+    return [];
+  }
+  return getSemanticTextFields(fields, '');
+};
+
+const getSemanticTextFields = (
+  fields: Record<string, MappingProperty>,
+  path: string
+): Array<{ path: string; source: SemanticTextProperty }> => {
+  return Object.entries(fields).flatMap(([key, value]) => {
+    const currentPath: string = path ? `${path}.${key}` : key;
+    const currentField: Array<{ path: string; source: SemanticTextProperty }> =
+      // @ts-expect-error because semantic_text type isn't incorporated in API type yet
+      value.type === 'semantic_text' ? [{ path: currentPath, source: value }] : [];
+    if (hasProperties(value)) {
+      const childSemanticTextFields: Array<{ path: string; source: SemanticTextProperty }> =
+        value.properties ? getSemanticTextFields(value.properties, currentPath) : [];
+      return [...currentField, ...childSemanticTextFields];
+    }
+    return currentField;
+  });
+};
+
+function hasProperties(field: MappingProperty): field is MappingPropertyBase {
+  return !!(field as MappingPropertyBase).properties;
+}
+
+function isLocalModel(model: InferenceServiceSettings): model is LocalInferenceServiceSettings {
+  return Boolean((model as LocalInferenceServiceSettings).service_settings.model_id);
+}
+
+export const IndexError: React.FC<IndexErrorProps> = ({ indexName }) => {
+  const { makeRequest: makeMappingRequest } = useActions(mappingsWithPropsApiLogic(indexName));
+  const { data } = useValues(mappingsWithPropsApiLogic(indexName));
+  const { ml } = useValues(KibanaLogic);
+  const [errors, setErrors] = useState<
+    Array<{ error: string; field: { path: string; source: SemanticTextProperty } }>
+  >([]);
+
+  const [showErrors, setShowErrors] = useState(false);
+
+  useEffect(() => {
+    makeMappingRequest({ indexName });
+  }, [indexName]);
+
+  useEffect(() => {
+    const mappings = data?.mappings;
+    if (!mappings || !ml) {
+      return;
+    }
+
+    const semanticTextFields = parseMapping(mappings);
+    const fetchErrors = async () => {
+      const trainedModelStats = await ml?.mlApi?.trainedModels.getTrainedModelStats();
+      const endpoints = await ml?.mlApi?.inferenceModels.getAllInferenceEndpoints();
+      if (!trainedModelStats || !endpoints) {
+        return [];
+      }
+
+      const semanticTextFieldsWithErrors = semanticTextFields
+        .map((field) => {
+          const model = endpoints.endpoints.find(
+            (endpoint) => endpoint.model_id === field.source.inference_id
+          );
+          if (!model) {
+            return {
+              error: i18n.translate(
+                'xpack.enterpriseSearch.indexOverview.indexErrors.missingModelError',
+                {
+                  defaultMessage: 'Model not found for inference endpoint {inferenceId}',
+                  values: {
+                    inferenceId: field.source.inference_id as string,
+                  },
+                }
+              ),
+              field,
+            };
+          }
+          if (isLocalModel(model)) {
+            const modelId = model.service_settings.model_id;
+            const modelStats = trainedModelStats?.trained_model_stats.find(
+              (value) => value.model_id === modelId
+            );
+            if (!modelStats || modelStats.deployment_stats?.state !== 'started') {
+              return {
+                error: i18n.translate(
+                  'xpack.enterpriseSearch.indexOverview.indexErrors.missingModelError',
+                  {
+                    defaultMessage:
+                      'Model {modelId} for inference endpoint {inferenceId} in field {fieldName} has not been started',
+                    values: {
+                      fieldName: field.path,
+                      inferenceId: field.source.inference_id as string,
+                      modelId,
+                    },
+                  }
+                ),
+                field,
+              };
+            }
+          }
+          return { error: '', field };
+        })
+        .filter((value) => !!value.error);
+      setErrors(semanticTextFieldsWithErrors);
+    };
+
+    if (semanticTextFields.length) {
+      fetchErrors();
+    }
+  }, [data]);
+  return errors.length > 0 ? (
+    <EuiCallOut
+      data-test-subj="indexErrorCallout"
+      color="danger"
+      iconType="error"
+      title={i18n.translate('xpack.enterpriseSearch.indexOverview.indexErrors.title', {
+        defaultMessage: 'Index has errors',
+      })}
+    >
+      {showErrors && (
+        <>
+          <p>
+            {i18n.translate('xpack.enterpriseSearch.indexOverview.indexErrors.body', {
+              defaultMessage: 'Found errors in the following fields:',
+            })}
+            {errors.map(({ field, error }) => (
+              <li key={field.path}>
+                <strong>{field.path}</strong>: {error}
+              </li>
+            ))}
+          </p>
+          <EuiButton
+            data-test-subj="enterpriseSearchIndexErrorHideFullErrorButton"
+            color="danger"
+            onClick={() => setShowErrors(false)}
+          >
+            {i18n.translate('xpack.enterpriseSearch.indexOverview.indexErrors.hideErrorsLabel', {
+              defaultMessage: 'Hide full error',
+            })}
+          </EuiButton>
+        </>
+      )}
+      {!showErrors && (
+        <EuiButton
+          data-test-subj="enterpriseSearchIndexErrorShowFullErrorButton"
+          color="danger"
+          onClick={() => setShowErrors(true)}
+        >
+          {i18n.translate('xpack.enterpriseSearch.indexOverview.indexErrors.showErrorsLabel', {
+            defaultMessage: 'Show full error',
+          })}
+        </EuiButton>
+      )}
+    </EuiCallOut>
+  ) : null;
+};

x-pack/plugins/enterprise_search/public/applications/enterprise_search_content/components/search_index/search_index.tsx

@@ -40,6 +40,7 @@ import { CrawlerConfiguration } from './crawler/crawler_configuration/crawler_co
 import { SearchIndexDomainManagement } from './crawler/domain_management/domain_management';
 import { NoConnectorRecord } from './crawler/no_connector_record';
 import { SearchIndexDocuments } from './documents';
+import { IndexError } from './index_error';
 import { SearchIndexIndexMappings } from './index_mappings';
 import { IndexNameLogic } from './index_name_logic';
 import { IndexViewLogic } from './index_view_logic';
@@ -239,6 +240,7 @@ export const SearchIndex: React.FC = () => {
         rightSideItems: getHeaderActions(index),
       }}
     >
+      <IndexError indexName={indexName} />
       <Content
         index={index}
         errorConnectingMessage={errorConnectingMessage}

x-pack/plugins/ml/public/application/services/ml_api_service/inference_models.ts

@@ -31,5 +31,18 @@ export function inferenceModelsApiProvider(httpService: HttpService) {
       });
       return result;
     },
+    /**
+     * Gets all inference endpoints
+     */
+    async getAllInferenceEndpoints() {
+      const result = await httpService.http<{
+        endpoints: estypes.InferenceModelConfigContainer[];
+      }>({
+        path: `${ML_INTERNAL_BASE_PATH}/_inference/all`,
+        method: 'GET',
+        version: '1',
+      });
+      return result;
+    },
   };
 }

x-pack/plugins/ml/server/routes/inference_models.ts

@@ -7,6 +7,7 @@
 import type { CloudSetup } from '@kbn/cloud-plugin/server';
 import { schema } from '@kbn/config-schema';
 import type { InferenceModelConfig, InferenceTaskType } from '@elastic/elasticsearch/lib/api/types';
+import type { InferenceAPIConfigResponse } from '@kbn/ml-trained-models-utils';
 import type { RouteInitialization } from '../types';
 import { createInferenceSchema } from './schemas/inference_schema';
 import { modelsProvider } from '../models/model_management';
@@ -63,4 +64,40 @@ export function inferenceModelRoutes(
         }
       )
     );
+  /**
+   * @apiGroup TrainedModels
+   *
+   * @api {put} /internal/ml/_inference/:taskType/:inferenceId Create Inference Endpoint
+   * @apiName CreateInferenceEndpoint
+   * @apiDescription Create Inference Endpoint
+   */
+  router.versioned
+    .get({
+      path: `${ML_INTERNAL_BASE_PATH}/_inference/all`,
+      access: 'internal',
+      options: {
+        tags: ['access:ml:canGetTrainedModels'],
+      },
+    })
+    .addVersion(
+      {
+        version: '1',
+        validate: {},
+      },
+      routeGuard.fullLicenseAPIGuard(async ({ client, response }) => {
+        try {
+          const body = await client.asCurrentUser.transport.request<{
+            models: InferenceAPIConfigResponse[];
+          }>({
+            method: 'GET',
+            path: `/_inference/_all`,
+          });
+          return response.ok({
+            body,
+          });
+        } catch (e) {
+          return response.customError(wrapError(e));
+        }
+      })
+    );
 }