Improved phrase suggestion.

src/app/geosource/services/elasticsearch.service.ts

@@ -283,8 +283,8 @@ export class ElasticsearchService {
   }
 
   /*
-  * This request will get one suggestion from the query text
-  * The suggest is based on metadata-fr.title property
+  * This request will get one phrase suggestion out of the query text
+  * cf. https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters-phrase.html
   */
   getSuggestion(query: string): Observable<SearchSuggestion> {
     return this._http.request<IElasticsearchResponse>('POST', this.url, {
@@ -293,16 +293,20 @@ export class ElasticsearchService {
           text: query,
           suggestion: {
             phrase: {
-              field: 'data_and_metadata',
+              field: 'data_and_metadata.suggest',
+              // as only the very first suggestion will be used, let's limit the size of the results to 1:
+              size: 1,
+              max_errors: query.split(' ').length,
               highlight: {
                 pre_tag: '<b><i>',
                 post_tag: '</i></b>',
               },
+              analyzer: 'my_search_analyzer',
               direct_generator: [{
-                field: 'data_and_metadata',
-                suggest_mode: 'popular',
-                // prefix_length: 4,
-                min_word_length: 1,
+                field: 'data_and_metadata.suggest',
+                suggest_mode: 'missing',
+                prefix_length: 1,
+                min_word_length: 4,
               }],
             },
           },

src/environments/environment.ts

@@ -11,7 +11,7 @@ export const environment = {
 
   // ElasticSearch
   elasticsearchUrl: {
-    full: servicesProxyUrl + '/elasticsearch2/test-all-in-one-index.full.v8.quadtree',
+    full: servicesProxyUrl + '/elasticsearch2/test-all-in-one-index.full.v9.quadtree',
     meta: servicesProxyUrl + '/elasticsearch/*.meta',
   },