Classy icons crafted according to Microsoft guidelines. Available in PNG and SVG. Free for a link
Feather Icons - Simply beautiful open source icons
Kaizen - Kaizen is an ElasticSearch GUI for Windows, Mac and Linux, written in JavaFX as a cross-platform desktop application.
IconStore - Free icon packs by first-class designers
ElasticHQ - Tool for ElasticSearch management and monitoring.
Flat Icons - 20,000 unique, customizable icons with free lifetime updates
elasticsearch-head - A web front end for an elastic search cluster