I've just released an analysis plugin that integrates Dandelion entity extraction service into elasticsearch.
It provides an analyzer that allows semantic searches based on the entities extracted from the input texts.
Actually, this facilitates the searches for documents dealing with specific concepts.
Another great functionality is the multilanguage option, which permits inter-language searches through the use of Wikipedia APIs.
The currently supported versions of ES are "6.2.3" and "6.2.4".
For more details and for information about installation and usage visit https://github.com/ZarHenry96/elasticsearch-dandelion-plugin.
In particular, see the Authorization section.
Any feedback and comment will be very appreciated.
I hope you'll find it useful,