fix bug with sort on multi text field in a request

search-core/src/main/java/org/opengroup/osdu/search/service/FieldMappingTypeService.java

@@ -85,10 +85,11 @@ public class FieldMappingTypeService implements IFieldMappingTypeService {
         for (Map.Entry<String, Map<String, GetFieldMappingsResponse.FieldMappingMetadata>> indexMapping : mappings.entrySet()) {
             if (indexMapping.getValue().isEmpty()) continue;
             Map<String, GetFieldMappingsResponse.FieldMappingMetadata> typeMapping = indexMapping.getValue();
-            GetFieldMappingsResponse.FieldMappingMetadata fieldMappingMetaData = typeMapping.values().iterator().next();
-            if (fieldMappingMetaData == null) continue;
-            String field = fieldMappingMetaData.fullName();
-            fieldTypeMap.put(field.substring(0, field.lastIndexOf(".keyword")), field);
+            for (Map.Entry<String, GetFieldMappingsResponse.FieldMappingMetadata> fieldMappingMetadataEntry : typeMapping.entrySet()) {
+                if (fieldMappingMetadataEntry.getValue() == null) continue;
+                String field = fieldMappingMetadataEntry.getValue().fullName();
+                fieldTypeMap.put(field.substring(0, field.lastIndexOf(".keyword")), field);
+            }
         }
 
         this.typeMappingCache.put(cacheKey, fieldTypeMap);

testing/integration-tests/search-test-core/src/main/resources/features/query/singlecluster/Query.feature

@@ -163,7 +163,7 @@ Feature: Search with different queries
     Then I should get records in right order first record id: <first_record_id>, last record id: <last_record_id>
     Examples:
       | kind                                      | query       | sort                                                                         | first_record_id       | last_record_id        |
-      | "tenant1:testquery<timestamp>:well:*"     | None        | {"field":["data.OriginalOperator"],"order":["ASC"]}                          | "test:well:1.0.0:1"   | "test:well:2.0.0:3"   |
+      | "tenant1:testquery<timestamp>:well:*"     | None        | {"field":["data.OriginalOperator","data.WellType"],"order":["ASC", "ASC"]}   | "test:well:1.0.0:1"   | "test:well:2.0.0:3"   |
       | "tenant1:testquery<timestamp>:well:*"     | None        | {"field":["id"],"order":["DESC"]}                                            | "test:well:2.0.0:3"   | "test:well:1.0.0:1"   |
       | "tenant1:testquery<timestamp>:well:*"     | None        | {"field":["namespace","data.Rank"],"order":["ASC","DESC"]}                   | "test:well:1.0.0:3"   | "test:well:2.0.0:1"   |
       | "tenant1:testnestedquery<timestamp>:well:2.0.0" | None  | {"field":["nested(data.VerticalMeasurements, VerticalMeasurement, min)"],"order":["ASC"]} | "test:well:1.0.0:2" | "test:well:1.0.0:1" |