@java.lang.Override
  public com.google.protobuf.FieldMask getUpdateMask() {
    return updateMask_ == null ? com.google.protobuf.FieldMask.getDefaultInstance() : updateMask_;
  }
<pre>
Required. Mask that specifies which fields in the workstation cluster
should be updated.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2 [(.google.api.field_behavior) = REQUIRED];
</code>

@return The updateMask.
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/UpdateWorkstationClusterRequest.java