It occurred error when I install bigdesk plugin

[stormy-wang]

Elasticsearch version:
2.3.0

Plugins installed:
elasticsearch-head-master

JVM version:
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

OS version:
Linux node215 3.13.0-83-generic #127-Ubuntu SMP Fri Mar 11 00:25:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Description of the problem including expected versus actual behavior:
I want to get ElasticSearch CLuster realtime performance information var bigdesk,but it occurred an error when I install the plugin. as follows:
NOTE: Unable to verify checksum for downloaded plugin (unable to find .sha1 or .md5 file to verify)
ERROR: Could not find plugin descriptor 'plugin-descriptor.properties' in plugin zip

Steps to reproduce:

1. I download the plugin from github https://github.com/lukas-vlcek/bigdesk
2. I installed the plugin to the one-node cluster used the command :
   ./bin/plugin install file:/home/elasticsearch-ansible/bigdesk-master.zip
3. then the error occurred:
   -> Installing from file:/home/elasticsearch-ansible/bigdesk-master.zip...
   Trying file:/home/elasticsearch-ansible/bigdesk-master.zip ...
   Downloading ....DONE
   Verifying file:/home/elasticsearch-ansible/bigdesk-master.zip checksums if available ...
   NOTE: Unable to verify checksum for downloaded plugin (unable to find .sha1 or .md5 file to verify)
   ERROR: Could not find plugin descriptor 'plugin-descriptor.properties' in plugin zip

[lukas-vlcek]

lukas-vlcek/bigdesk#84 (comment)

[clintongormley]

This is a community plugin not supported by Elasticsearch. Closing