public OperationCallSettings.Builder<
            StartMigrationRequest, StartMigrationResponse, OperationMetadata>
        startMigrationOperationSettings() {
      return startMigrationOperationSettings;
    }
Returns the builder for the settings used for calls to startMigration.
java-vmmigration/google-cloud-vmmigration/src/main/java/com/google/cloud/vmmigration/v1/stub/VmMigrationStubSettings.java