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Database indexing speeds up data retrieval by allowing quick lookups.

An inverted index helps search engines quickly find documents containing specific terms.

B-Trees help databases find data quickly without scanning every row.

You can update Elasticsearch indices without downtime using alias switching.

Composite indexes speed up database queries that filter or sort by multiple columns.

Elasticsearch index templates automatically apply settings to new indices based on patterns.

Search engines collect, index, retrieve, and rank documents to provide relevant results.

The dual-write trap in Elasticsearch can cause data inconsistency during reindexing.