Match all query

Match all query #

Matches every document. This is the default query used when no query is sent in a search request — relevance-free, constant-scored, and the base every “everything, then narrow” pattern builds on.

How it works #

match_all walks every document in the target indexes with a constant score — 1.0 — so _score carries no ranking information and downstream score arithmetic (indices_boost, bool should boosts, cross-engine merges) sees the same baseline everywhere. boost multiplies the constant, and is the only parameter there is.