Advanced Elasticsearch 7.0

Mapping

A schema could mean an outline, diagram, or model, which is often used to describe the structure of different types of data. Elasticsearch is reputed to be schema-less, in contrast to traditional relational databases. In traditional relational databases, you must explicitly specify tables, fields, and field types. In Elasticsearch, schema-less simply means that the document can be indexed without specifying the schema in advance. Under the hood though, Elasticsearch dynamically derives a schema from the first document's index structure and decides how to index them when no explicit static mapping is specified. Elasticsearch enforces the term schema called mapping, which is a process of defining how Lucene stores the indexed document ...