public com.google.cloud.visionai.v1.FacetValue.Builder getBucketStartBuilder() {
        bitField0_ |= 0x00000001;
        onChanged();
        return getBucketStartFieldBuilder().getBuilder();
      }
<pre>
Lower bound of the bucket. NOTE: Only integer type is currently supported
for this field.
</pre>

<code>.google.cloud.visionai.v1.FacetValue bucket_start = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/FacetProperty.java