diff --git a/go/v1beta1/storage/esutil/client.go b/go/v1beta1/storage/esutil/client.go
index 08cf14f..0d81985 100644
--- a/go/v1beta1/storage/esutil/client.go
+++ b/go/v1beta1/storage/esutil/client.go
@@ -63,6 +63,7 @@ type BulkRequestItem struct {
 
 type MultiSearchRequest struct {
 	Index    string
+	Routing  string
 	Searches []*EsSearch
 }
 
@@ -388,7 +389,8 @@ func (c *client) MultiSearch(ctx context.Context, request *MultiSearchRequest) (
 	log := c.logger.Named("MultiSearch")
 
 	searchMetadata, _ := json.Marshal(&EsMultiSearchQueryFragment{
-		Index: request.Index,
+		Index:   request.Index,
+		Routing: request.Routing,
 	})
 	searchMetadata = append(searchMetadata, '\n')
 
diff --git a/go/v1beta1/storage/esutil/client_test.go b/go/v1beta1/storage/esutil/client_test.go
index 8f956cd..23db0fd 100644
--- a/go/v1beta1/storage/esutil/client_test.go
+++ b/go/v1beta1/storage/esutil/client_test.go
@@ -774,6 +774,7 @@ var _ = Describe("elasticsearch client", func() {
 				if i%2 == 0 { // search metadata
 					metadata := payload.(*EsMultiSearchQueryFragment)
 					Expect(metadata.Index).To(Equal(expectedIndex))
+					Expect(metadata.Routing).To(BeEmpty())
 				} else { // search
 					search := payload.(*EsSearch)
 					expectedSearch := expectedSearches[(i-1)/2]
@@ -800,6 +801,38 @@ var _ = Describe("elasticsearch client", func() {
 				Expect(actualErr).To(HaveOccurred())
 			})
 		})
+
+		When("routing is specified", func() {
+			var expectedRouting string
+
+			BeforeEach(func() {
+				expectedRouting = fake.LetterN(10)
+				expectedMultiSearchRequest.Routing = expectedRouting
+			})
+
+			It("should include the routing value in each search header", func() {
+				var expectedPayloads []interface{}
+
+				for i := 0; i < len(expectedSearches); i++ {
+					expectedPayloads = append(expectedPayloads, &EsMultiSearchQueryFragment{}, &EsSearch{})
+				}
+
+				parseNDJSONRequestBody(transport.ReceivedHttpRequests[0].Body, expectedPayloads)
+
+				for i, payload := range expectedPayloads {
+					if i%2 == 0 { // search metadata
+						metadata := payload.(*EsMultiSearchQueryFragment)
+						Expect(metadata.Index).To(Equal(expectedIndex))
+						Expect(metadata.Routing).To(Equal(expectedRouting))
+					} else { // search
+						search := payload.(*EsSearch)
+						expectedSearch := expectedSearches[(i-1)/2]
+
+						Expect(search).To(Equal(expectedSearch))
+					}
+				}
+			})
+		})
 	})
 
 	Context("Get", func() {
diff --git a/go/v1beta1/storage/esutil/types.go b/go/v1beta1/storage/esutil/types.go
index 472228e..05ee213 100644
--- a/go/v1beta1/storage/esutil/types.go
+++ b/go/v1beta1/storage/esutil/types.go
@@ -131,7 +131,8 @@ type EsBulkResponseItem struct {
 // Elasticsearch /_msearch query fragments
 
 type EsMultiSearchQueryFragment struct {
-	Index string `json:"index"`
+	Index   string `json:"index"`
+	Routing string `json:"routing,omitempty"`
 }
 
 // Elasticsearch /_msearch response