Plugin resource's plugin_dir should have a sensible default

[michaelklishin]

README examples and even code comments use usr/local/awesome/elasticsearch-version/plugins as a plugin_dir value. I'm not sure if that's a real world example or not. Surely ElasticSearch provides a standard plugins directory: why doesn't this cookbook have a default for that? Why do the users have to even think about where to put the plugins?

[martinb3]

Have you tried to use the elasticsearch_plugin with the defaults? It actually does default to the typical path. This cookbook was written to handle a very commonly requested case of multiple instances per server. We'll try to provide better documentation in the future.