public Builder clearFilter() {
      filter_ = getDefaultInstance().getFilter();
      bitField0_ = (bitField0_ & ~0x00000008);
      onChanged();
      return this;
    }
<pre>
Optional. An expression for filtering the results of the request.
Filter is not supported yet.
</pre>

<code>string filter = 4 [(.google.api.field_behavior) = OPTIONAL];</code>

@return This builder for chaining.
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/ListAdaptiveMtDatasetsRequest.java