Fix routing and tidy up

This commit fixes the `routing` parameter for Multi Get API and
More Like This API.

Furthermore, we tidied up and updated Go dependencies.

Close olivere#1266
Close olivere#1282

Author: olivere

Diff for: go.mod

@@ -3,15 +3,17 @@ module github.com/olivere/elastic/v7
 go 1.13
 
 require (
-	github.com/aws/aws-sdk-go v1.27.0
+	github.com/aws/aws-sdk-go v1.28.12
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fortytw2/leaktest v1.3.0
-	github.com/golang/mock v1.2.0 // indirect
-	github.com/google/go-cmp v0.3.1
+	github.com/google/go-cmp v0.4.0
+	github.com/kr/pretty v0.2.0 // indirect
 	github.com/mailru/easyjson v0.7.0
+	github.com/olivere/elastic v6.2.27+incompatible
 	github.com/opentracing/opentracing-go v1.1.0
-	github.com/pkg/errors v0.8.1
+	github.com/pkg/errors v0.9.1
 	github.com/smartystreets/go-aws-auth v0.0.0-20180515143844-0c1422d1fdb9
-	go.opencensus.io v0.22.2
-	google.golang.org/api v0.3.1 // indirect
+	github.com/smartystreets/gunit v1.1.3 // indirect
+	go.opencensus.io v0.22.3
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )

Diff for: mget.go

@@ -291,7 +291,7 @@ func (item *MultiGetItem) Source() (interface{}, error) {
 		source["_source"] = src
 	}
 	if item.routing != "" {
-		source["_routing"] = item.routing
+		source["routing"] = item.routing
 	}
 	if len(item.storedFields) > 0 {
 		source["stored_fields"] = strings.Join(item.storedFields, ",")

Diff for: recipes/go.mod

@@ -394,7 +394,7 @@ func (item *MoreLikeThisQueryItem) Source() (interface{}, error) {
 		source["fields"] = item.fields
 	}
 	if item.routing != "" {
-		source["_routing"] = item.routing
+		source["routing"] = item.routing
 	}
 	if item.fsc != nil {
 		src, err := item.fsc.Source()

Diff for: search_queries_more_like_this.go

@@ -43,7 +43,7 @@ func TestMoreLikeThisQuerySourceWithLikeAndUnlikeItems(t *testing.T) {
 		t.Fatal(err)
 	}
 	got := string(data)
-	expected := `{"more_like_this":{"like":[{"_id":"1"},{"_id":"2","_index":"elastic-test2","_routing":"routing_id","_type":"comment"}],"unlike":[{"_id":"3"}]}}`
+	expected := `{"more_like_this":{"like":[{"_id":"1"},{"_id":"2","_index":"elastic-test2","_type":"comment","routing":"routing_id"}],"unlike":[{"_id":"3"}]}}`
 	if got != expected {
 		t.Fatalf("expected\n%s\n,got:\n%s", expected, got)
 	}