@Override
  public Object execute(Op op) {
    return execute(op, retryAttempts);
  }
Called from the client and execute client to server requests against servers. Handles retrying to
different servers, and marking servers dead if we get exception from them.

@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/cache/client/internal/OpExecutorImpl.java