public static Builder newBuilder(
          com.google.cloud.visionai.v1.DataSchemaDetails.SearchStrategy.ConfidenceScoreIndexConfig
              prototype) {
        return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
      }
<pre>
Required. The threshold.
</pre>

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

@return The threshold.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/DataSchemaDetails.java