public com.google.protobuf.ByteString getFieldPathBytes() {
          java.lang.Object ref = fieldPath_;
          if (ref instanceof String) {
            com.google.protobuf.ByteString b =
                com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
            fieldPath_ = b;
            return b;
          } else {
            return (com.google.protobuf.ByteString) ref;
          }
        }
<pre>
Required. The path to the confidence score field. It is a string that
concatenates all the data schema keys along the path. See the example
above. If the data schema contains LIST, use '_ENTRIES' to concatenate.
Example data schema contains a list:
"key": "list-name-score",
"schemaDetails": {
  "type": "LIST",
  "granularity": "GRANULARITY_PARTITION_LEVEL",
  "listConfig": {
    "valueSchema": {
      "type": "CUSTOMIZED_STRUCT",
      "granularity": "GRANULARITY_PARTITION_LEVEL",
      "customizedStructConfig": {
        "fieldSchemas": {
          "name": {
            "type": "STRING",
            "granularity": "GRANULARITY_PARTITION_LEVEL",
            "searchStrategy": {
              "searchStrategyType": "SMART_SEARCH"
              "confidence_score_index_config": {
                "field_path": "list-name-score._ENTRIES.score",
                "threshold": "0.9",
              }
            }
          },
          "score": {
            "type": "FLOAT",
            "granularity": "GRANULARITY_PARTITION_LEVEL",
          }
        }
      }
    }
  }
}
</pre>

<code>string field_path = 1 [(.google.api.field_behavior) = REQUIRED];</code>

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