private String inferLocation() {
    return getEnvironmentVariable(Constants.GOOGLE_CLOUD_REGION)
        .orElse(
            getEnvironmentVariable(Constants.CLOUD_ML_REGION).orElse(Constants.DEFAULT_LOCATION));
  }
Returns the {@link LlmUtilityServiceClient} with GRPC or REST, based on the Transport type. The
client will be instantiated when the first API call is made.

@return {@link LlmUtilityServiceClient} that makes calls to the backing service through method
    calls that map to the API methods.
java-vertexai/google-cloud-vertexai/src/main/java/com/google/cloud/vertexai/VertexAI.java