diff --git a/pkg/controller/elasticsearch/client/model.go b/pkg/controller/elasticsearch/client/model.go
index 7b13555aef..3c835121fa 100644
--- a/pkg/controller/elasticsearch/client/model.go
+++ b/pkg/controller/elasticsearch/client/model.go
@@ -293,7 +293,8 @@ type License struct {
 	IssueDateInMillis  int64      `json:"issue_date_in_millis"`
 	ExpiryDate         *time.Time `json:"expiry_date,omitempty"`
 	ExpiryDateInMillis int64      `json:"expiry_date_in_millis"`
-	MaxNodes           int        `json:"max_nodes"`
+	MaxNodes           int        `json:"max_nodes,omitempty"`
+	MaxResourceUnits   int        `json:"max_resource_units,omitempty"`
 	IssuedTo           string     `json:"issued_to"`
 	Issuer             string     `json:"issuer"`
 	StartDateInMillis  int64      `json:"start_date_in_millis"`
diff --git a/pkg/controller/elasticsearch/client/model_test.go b/pkg/controller/elasticsearch/client/model_test.go
index 936489e4c8..305f8171f2 100644
--- a/pkg/controller/elasticsearch/client/model_test.go
+++ b/pkg/controller/elasticsearch/client/model_test.go
@@ -58,6 +58,52 @@ func TestModel_RemoteCluster(t *testing.T) {
 	}
 }
 
+func TestModel_License(t *testing.T) {
+	tests := []struct {
+		name    string
+		license License
+		want    string
+	}{
+		{
+			name: "platinum",
+			license: License{
+				UID:                "304d04fe-c2d2-8774-cd34-7a71a4cc8c4d",
+				Type:               "platinum",
+				IssueDateInMillis:  1576000000000,
+				ExpiryDateInMillis: 1590000000000,
+				MaxNodes:           100,
+				IssuedTo:           "ECK Test",
+				Issuer:             "ECK Tester",
+				StartDateInMillis:  1576000000000,
+				Signature:          "AAA...xyz",
+			},
+			want: `{"uid":"304d04fe-c2d2-8774-cd34-7a71a4cc8c4d","type":"platinum","issue_date_in_millis":1576000000000,"expiry_date_in_millis":1590000000000,"max_nodes":100,"issued_to":"ECK Test","issuer":"ECK Tester","start_date_in_millis":1576000000000,"signature":"AAA...xyz"}`,
+		},
+		{
+			name: "enterprise",
+			license: License{
+				UID:                "304d04fe-c2d2-8774-cd34-7a71a4cc8c4d",
+				Type:               "enterprise",
+				IssueDateInMillis:  1576000000000,
+				ExpiryDateInMillis: 1590000000000,
+				MaxResourceUnits:   100,
+				IssuedTo:           "ECK Test",
+				Issuer:             "ECK Tester",
+				StartDateInMillis:  1576000000000,
+				Signature:          "AAA...xyz",
+			},
+			want: `{"uid":"304d04fe-c2d2-8774-cd34-7a71a4cc8c4d","type":"enterprise","issue_date_in_millis":1576000000000,"expiry_date_in_millis":1590000000000,"max_resource_units":100,"issued_to":"ECK Test","issuer":"ECK Tester","start_date_in_millis":1576000000000,"signature":"AAA...xyz"}`,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			json, err := json.Marshal(tt.license)
+			assert.NoError(t, err)
+			assert.Equal(t, tt.want, string(json))
+		})
+	}
+}
+
 func TestClusterRoutingAllocation(t *testing.T) {
 	clusterSettingsSample := `{"persistent":{},"transient":{"cluster":{"routing":{"allocation":{"enable":"none","exclude":{"_name":"excluded"}}}}}}`
 	expected := ClusterRoutingAllocation{Transient: AllocationSettings{Cluster: ClusterRoutingSettings{Routing: RoutingSettings{Allocation: RoutingAllocationSettings{Enable: "none", Exclude: AllocationExclude{Name: "excluded"}}}}}}