public Builder clearBucketStart() {
        bitField0_ = (bitField0_ & ~0x00000001);
        bucketStart_ = null;
        if (bucketStartBuilder_ != null) {
          bucketStartBuilder_.dispose();
          bucketStartBuilder_ = null;
        }
        onChanged();
        return this;
      }
<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