Data Modeling

• Document is a unit of storage, indexing, search, and aggregation

• 3rd norm of normalization (or beyond) does not apply to ElasticSearch

• ElasticSearch supports no join or its equivalents

• Document indexing, searching, and aggregation uses no locks

• ElasticSearch designed for scalability

• Application side joins: a no-no in a Rdbms world and is a common practice in NoSql world

• Data de-normalization: redundant copies of data in each document removes needs for join

• Nested objects: storing parent and child data in a single document

• Parent-Child Relationship: storing child documents separately and are associated with parent document

• ElasticSearch lacks built-in mechanism for de-normalized data maintenance, so are many other NoSql