Lightning–fast

Elasticsearch uses Apache Lucene as its underlying technology. By default, Elasticsearch indexes all the fields of your documents. This is extremely invaluable as you can query or search by any field in your records. You will never be in a situation in which you think, If only I had chosen to create an index on this field. Elasticsearch contributors have leveraged Apache Lucene to its best advantage, and there are other optimizations that make it lightning-fast.