Integration test to verify version support for inner hits in field collapsing (#3295)

* Integration test to verify version support for inner hits in field collapsing.

Closes #3261

Author: Stuart Cam

src/Tests/Search/Request/InnerHitsUsageTests.cs

@@ -268,7 +268,8 @@ public QueryInnerHitsApiTests(IntrusiveOperationCluster cluster, EndpointUsage u
 									{
 										fields = new { fullTextField = new { } }
 									},
-									ignore_unmapped = false
+									ignore_unmapped = false,
+									version = true
 								}
 							}
 						},
@@ -278,7 +279,7 @@ public QueryInnerHitsApiTests(IntrusiveOperationCluster cluster, EndpointUsage u
 							{
 								query = new { match_all = new { } },
 								path = "foes",
-								inner_hits = new { }
+								inner_hits = new { version = true }
 							}
 						}
 					}
@@ -297,14 +298,16 @@ public QueryInnerHitsApiTests(IntrusiveOperationCluster cluster, EndpointUsage u
 						.Name("princes")
 						.Highlight(h=>h.Fields(f=>f.Field(p=>p.FullTextField)))
 						.IgnoreUnmapped(false)
+						.Version()
 					)
 
 				) || q.Nested(n => n
 					.Path(p => p.Foes)
 					.Query(nq => nq.MatchAll())
-					.InnerHits()
+					.InnerHits(i => i.Version())
 				)
-			);
+			)
+			.Version();
 
 		protected override SearchRequest<King> Initializer => new SearchRequest<King>(Index, RoyalSeeder.RoyalType)
 		{
@@ -317,21 +320,30 @@ public QueryInnerHitsApiTests(IntrusiveOperationCluster cluster, EndpointUsage u
 					Name = "princes",
 					DocValueFields = Field<Prince>(p=>p.Name),
 					Highlight = Highlight.Field(Field<Prince>(p=>p.FullTextField)),
-					IgnoreUnmapped = false
+					IgnoreUnmapped = false,
+					Version = true
 				}
 			} || new NestedQuery
 			{
 				Path = Field<King>(p => p.Foes),
 				Query = new MatchAllQuery(),
 				InnerHits = new InnerHits()
-			}
+				{
+					Version = true
+				}
+			},
+			Version = true
 		};
 
 		protected override void ExpectResponse(ISearchResponse<King> response)
 		{
 			response.Hits.Should().NotBeEmpty();
 			foreach (var hit in response.Hits)
 			{
+				hit.Id.Should().NotBeNullOrEmpty();
+				hit.Index.Should().NotBeNullOrEmpty();
+				hit.Version?.Should().Be(1);
+
 				var princes = hit.InnerHits["princes"].Documents<Prince>();
 				princes.Should().NotBeEmpty();
 				foreach (var princeHit in hit.InnerHits["princes"].Hits.Hits)
@@ -347,6 +359,7 @@ protected override void ExpectResponse(ISearchResponse<King> response)
 					var docValueName = princeHit.Fields.ValueOf<Prince, string>(p=>p.Name);
 					docValueName.Should().NotBeNullOrWhiteSpace("value of name on Fields");
 
+					princeHit.Version?.Should().Be(1);
 				}
 
 				var foes = hit.InnerHits["foes"].Documents<King>();