Something does not look right here, we do not use the cluster name as part of the data path anymore. Please remove Elasticsearch:
$ brew remove elasticsearch
$ rm -rf /usr/local/var/elasticsearch
$ rm -rf /usr/local/etc/elasticsearch
and start again:
$ brew install elasticsearch
Lastly, since this looks like an environment problem, I'm going to close this issue. We reserve GitHub for verified bug reports and feature requests. If you have additional questions, please open a topic on the forum.