Elasticsearch is an Open Source (Apache 2), Distributed, RESTful, Search Engine based on Lucene.
Kibana is an application for exploring and visualizing your data
"If you would like a unified front-end for elasticsearch and opentsdb you could consider grafana which has support for both elasticsearch and opentsdb but less functionality than kibana in regard to elasticsearch"
from question "What is the difference between kibana and opentsdb"
"Odd that elasticsearch is more tolerant than kibana"
from question "Kibana 4 'Discover' search error"