Explanation yaml files added

Author: mridula-s109

x-pack/plugin/search-business-rules/src/main/java/org/elasticsearch/xpack/searchbusinessrules/retriever/PinnedRetrieverBuilder.java

@@ -100,14 +100,12 @@ private void validateSort(SearchSourceBuilder source) {
                 continue;
             }
             if (sort instanceof FieldSortBuilder) {
-                 FieldSortBuilder fieldSort = (FieldSortBuilder) sort;
-                 if (ShardDocSortField.NAME.equals(fieldSort.getFieldName())) {
-                     continue;
-                 }
+                FieldSortBuilder fieldSort = (FieldSortBuilder) sort;
+                if (ShardDocSortField.NAME.equals(fieldSort.getFieldName())) {
+                    continue;
+                }
             }
-            throw new IllegalArgumentException(
-                "Pinned retriever only supports sorting by score. Custom sorting is not allowed."
-            );
+            throw new IllegalArgumentException("Pinned retriever only supports sorting by score. Custom sorting is not allowed.");
         }
     }
 

x-pack/plugin/search-business-rules/src/yamlRestTest/resources/rest-api-spec/test/search-business-rules/10_pinned_retriever.yml

@@ -289,28 +289,33 @@ setup:
   - match: { hits.hits.1._id: doc2 }
   - match: { hits.hits.2._id: doc3 }
 
-# ---
-# "pinned retriever explanation":
-#   - do:
-#       search:
-#         index: test-index1
-#         body:
-#           retriever:
-#             pinned:
-#               ids: ["doc1", "doc2"]
-#               retriever:
-#                 standard:
-#                   query:
-#                     match_all: {}
-#           explain: true
-
-#   - match: { hits.hits.0._id: doc1 }
-#   - match: { hits.hits.0._explanation.description: /^doc.*queries\.$/ }
-#   - match: { hits.hits.0._explanation.details.0.details.0.details.1.description: "is_pinned: true" }
-
-#   - match: { hits.hits.1._id: doc2 }
-#   - match: { hits.hits.1._explanation.description: /^doc.*queries\.$/ }
-#   - match: { hits.hits.1._explanation.details.0.details.0.details.1.description: "is_pinned: true" }
+---
+"pinned retriever explanation":
+  - skip:
+      features: headers
+
+  - do:
+      headers:
+        Content-Type: application/json
+      search:
+        index: test-index1
+        body:
+          retriever:
+            pinned:
+              ids: ["doc1", "doc2"]
+              retriever:
+                standard:
+                  query:
+                    match_all: {}
+          explain: true
+
+  - match: { hits.hits.0._id: doc1 }
+  - match: { hits.hits.0._explanation.value: 1.0 }
+  - match: { hits.hits.0._explanation.description: "doc [0] with an original score of [1.7014124E38] is at rank [1] from the following source queries." }
+
+  - match: { hits.hits.1._id: doc2 }
+  - match: { hits.hits.1._explanation.value: 2.0 }
+  - match: { hits.hits.1._explanation.description: "doc [1] with an original score of [1.7014122E38] is at rank [2] from the following source queries." }
 
 ---
 "pinned retriever with empty parameters":