Allow searching accross multiple fields (fixes #43)

server/lib/elastic-search/shared/query-helpers.ts

@@ -48,6 +48,15 @@ function buildMultiMatchBool (search: string, fieldsObject: { default: string[],
                 minimum_should_match: ELASTIC_SEARCH_QUERY.MINIMUM_SHOULD_MATCH
               }
             },
+            {
+              multi_match: {
+                query: search,
+                fields: fieldsObject.default,
+                operator: ELASTIC_SEARCH_QUERY.OPERATOR,
+                minimum_should_match: ELASTIC_SEARCH_QUERY.MINIMUM_SHOULD_MATCH,
+                type: "cross_fields"
+              }
+            },
             {
               multi_match: {
                 query: search,