Update 100-elasticsearch.md (#1011)

* Update 100-elasticsearch.md

* Add elasticsearch details

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/101-backend/content/116-search-engines/100-elasticsearch.md

@@ -1 +1,10 @@
-# Elasticsearch
+# Elasticsearch
+
+Elastic search at its core is a document-oriented search engine. It is a document based database that lets you INSERT, DELETE , RETRIEVE and even perform analytics on the saved records. But, Elastic Search is unlike any other general purpose database you have worked with, in the past. It's essentially a search engine and offers an arsenal of features you can use to retrieve the data stored in it, as per your search criteria. And that too, at lightning speeds.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+
+<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://www.elastic.co/elasticsearch/'>Elasticsearch Website</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Official Docs' href='https://www.elastic.co/guide/index.html'>Elasticsearch Documentation</BadgeLink>
+
+