[elk@localhost~/elasticsearch-2.3.1/plugins]$../bin/plugin install mobz/elasticsearch-head -> Installing mobz/elasticsearch-head... Trying https://github.com/mobz/elasticsearch-head/archive/master.zip ... Downloading ...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................DONE Verifying https://github.com/mobz/elasticsearch-head/archive/master.zip checksums if available ... NOTE: Unable to verify checksum for downloaded plugin (unable to find .sha1 or .md5 file to verify) Installed head into /home/elk/elasticsearch-2.3.1/plugins/head