Add maxComplexObjectsInCollectionsPerDocument to ServiceStats limits (#6721)

Author: enjaimes

specification/search/data-plane/Microsoft.Azure.Search.Service/stable/2019-05-06/examples/SearchServiceGetServiceStatistics.json

@@ -36,7 +36,8 @@
         "limits": {
           "maxFieldsPerIndex": 1000,
           "maxFieldNestingDepthPerIndex": 10,
-          "maxComplexCollectionFieldsPerIndex": 100
+          "maxComplexCollectionFieldsPerIndex": 100,
+          "maxComplexObjectsInCollectionsPerDocument":  3000
         }
       }
     }

specification/search/data-plane/Microsoft.Azure.Search.Service/stable/2019-05-06/searchservice.json

@@ -5290,6 +5290,12 @@
           "format": "int32",
           "x-nullable": true,
           "description": "The maximum number of fields of type Collection(Edm.ComplexType) allowed in an index."
+        },
+        "maxComplexObjectsInCollectionsPerDocument": {
+          "type": "integer",
+          "format": "int32",
+          "x-nullable": true,
+          "description": "The maximum number of objects in complex collections allowed per document."
         }
       },
       "description": "Represents various service level limits."