hi i have this error :
java.lang.IllegalArgumentException: property [elasticsearch.version] is missing for plugin [head]
it's impossible to install this
/var/www/elasticsearch-head/node_modules/grunt-contrib-jasmine/node_modules/grunt-lib-phantomjs/node_modules/phantomjs-prebuilt/node_modules/request/node_modules/hawk/node_modules/boom/lib/index.js:5
const Hoek = require('hoek');
^^^^^
SyntaxError: Use of const in strict mode.
at Module._compile (module.js:439:25)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object. (/var/www/elasticsearch-head/node_modules/grunt-contrib-jasmine/node_modules/grunt-lib-phantomjs/node_modules/phantomjs-prebuilt/node_modules/request/node_modules/hawk/lib/index.js:5:33)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
npm WARN This failure might be due to the use of legacy binary "node"
thanks