@Override
  public void close() {
    validationExecutor.shutdownNow();
    try {
      //noinspection ResultOfMethodCallIgnored
      validationExecutor.awaitTermination(5, SECONDS);
    } catch (final Exception e) {
      LOG.error("Error shutting down validatorExecutor.", e);
    }

    importExecutor.shutdownNow();
    try {
      //noinspection ResultOfMethodCallIgnored
      importExecutor.awaitTermination(5, SECONDS);
    } catch (final Exception e) {
      LOG.error("Error shutting down importExecutor", e);
    }
  }
Import blockchain.

@param blocks the blocks
@param besuController the besu controller
@param skipPowValidation the skip pow validation
@param startBlock the start block
@param endBlock the end block
@return the rlp block importer - import result
@throws IOException the io exception
app/src/main/java/org/hyperledger/besu/chainimport/RlpBlockImporter.java