From e1bc31e27e49e221efb0e5bb2c97faf3b5728ab2 Mon Sep 17 00:00:00 2001
From: Pascal Seitz <pascal.seitz@gmail.com>
Date: Mon, 3 Aug 2026 10:45:51 +0200
Subject: [PATCH] docs: document exists query syntax

---
 src/query/query_parser/query_parser.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/query/query_parser/query_parser.rs b/src/query/query_parser/query_parser.rs
index 694acb3f4..3c5d9cf82 100644
--- a/src/query/query_parser/query_parser.rs
+++ b/src/query/query_parser/query_parser.rs
@@ -181,6 +181,10 @@ fn trim_ast(logical_ast: LogicalAst) -> Option<LogicalAst> {
 ///   `"2002-10-02T15:00:00.05Z"` or `some_date_field:[2002-10-02T15:00:00Z TO
 ///   2002-10-02T18:00:00Z}`
 ///
+/// * exists query: `field:*` will match documents that contain a non-null value in the specified
+///   field. The field must be configured as a fast field. For JSON fields, values in subpaths also
+///   count as existing.
+///
 /// * all docs query: A plain `*` will match all documents in the index.
 ///
 /// Parts of the queries can be boosted by appending `^boostfactor`.