Use nested query in nested field test

Also, add a test that actually returns a document.

Author: jordan-powers

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/tsdb/160_nested_fields.yml

@@ -33,7 +33,7 @@
   - do:
       index:
         index: test
-        body: { "@timestamp": "2021-04-28T01:00:00Z", "department": "compsci", "staff": 12, "courses": [ { "name": "Object Oriented Programming", "credits": 3 }, { "name": "Theory of Computation", "credits": 4, } ] }
+        body: { "@timestamp": "2021-04-28T01:00:00Z", "department": "compsci", "staff": 12, "courses": [ { "name": "Object Oriented Programming", "credits": 3 }, { "name": "Theory of Computation", "credits": 4 } ] }
 
   - do:
       index:
@@ -50,12 +50,34 @@
         body:
           size: 0
           query:
-            bool:
-              must:
-                - term:
-                    courses.name: Precalculus
-                - term:
-                    courses.credits: 3
+            nested:
+              path: "courses"
+              query:
+                bool:
+                  must:
+                    - term:
+                        courses.name: Precalculus
+                    - term:
+                        courses.credits: 3
 
-  - match:
-     hits.total.value: 0
+  - match: { hits.total.value: 0 }
+
+  - do:
+      search:
+        index: test
+        body:
+          query:
+            nested:
+              path: "courses"
+              query:
+                bool:
+                  must:
+                    - term:
+                        courses.name: "Object Oriented Programming"
+                    - term:
+                        courses.credits: 3
+
+  - match: { hits.total.value: 1 }
+  - match: { "hits.hits.0._source.@timestamp": "2021-04-28T01:00:00.000Z" }
+  - match: { hits.hits.0._source.department: "compsci" }
+  - match: { hits.hits.0._source.courses:  [ { "name": "Object Oriented Programming", "credits": 3 }, { "name": "Theory of Computation", "credits": 4, } ] }