public static com.google.protobuf.Parser<ConfidenceScoreIndexConfig> parser() {
        return PARSER;
      }
<pre>
Required. The threshold.
</pre>

<code>float threshold = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return This builder for chaining.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/DataSchemaDetails.java