Elasticsearch is an open source distributed, RESTful search and analytics engine. Its popularity is due to its ease of use, powerful features, and scalability.
Elasticsearch supports RESTful operations.
Nagios, now known as Nagios Core, is a free and Open Source monitoring tool, that monitors systems, networks and infrastructure.
With Nagios, you can monitor your remote hosts and their services remotely on a single window.
The elasticsearch bulk API makes it possible to perform many insert/update/index/delete operations in a single API call. This can greatly increase the indexing speed.
Clients supports for bulk API requests
Some of the officially supported clients provide helpers to assist with bulk API requests.