public Builder clearUpdateMask() {
      bitField0_ = (bitField0_ & ~0x00000002);
      updateMask_ = null;
      if (updateMaskBuilder_ != null) {
        updateMaskBuilder_.dispose();
        updateMaskBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. The update mask applies to the resource. See
[google.protobuf.FieldMask][google.protobuf.FieldMask].
</pre>

<code>.google.protobuf.FieldMask update_mask = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/UpdateEndpointRequest.java