What is an index in ElasticSearch?

1.	What is an index in ElasticSearch?
Answer» An index is a COLLECTION of DOCUMENTS that are somewhat similar in nature. As an example, you could have an index of customer data, another ONE of product catalogs, and another one of order data. The name of an index (which must be all lowercase) serves as an identifier for the index when indexing, SEARCHING, updating, and deleting documents contained within it. An index (plural: indices) can have one or more than one shards and replicas.

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