From 7094705a4cf0308d8f998d889273ba7ab6b41947 Mon Sep 17 00:00:00 2001
From: Aivaras Gotovskis <aivaras.gotovskis@ongr.io>
Date: Tue, 7 Jul 2015 11:55:47 +0300
Subject: [PATCH] Add exists filter doc.
---
docs/Filter/Exists.md | 31 +++++++++++++++++++++++++++++++
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create mode 100644 docs/Filter/Exists.md
diff --git a/docs/Filter/Exists.md b/docs/Filter/Exists.md
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+# Exists Filter
+
+> More info about exists filter is in the [official elasticsearch docs][1]
+
+Returns documents that have at least one non-null value in the original field.
+
+## Simple example
+
+```JSON
+{
+ "constant_score" : {
+ "filter" : {
+ "exists" : { "field" : "user" }
+ }
+ }
+}
+```
+
+And now the query via DSL:
+
+```php
+$existsFilter = new ExistsFilter('user');
+$constantScoreQuery = new ConstantScoreQuery($existsFilter);
+
+$search = new Search();
+$search->addQuery($constantScoreQuery);
+
+$queryArray = $search->toArray();
+```
+
+[1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-exists-filter.html
--
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