private void ensureMappedFieldsIsMutable() {
      if (!mappedFields_.isModifiable()) {
        mappedFields_ = new com.google.protobuf.LazyStringArrayList(mappedFields_);
      }
      bitField0_ |= 0x00000008;
    }
<pre>
Datetime range facet bucket config.
</pre>

<code>.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec datetime_bucket_spec = 7;
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/FacetProperty.java