From 693edc3ca70a85bd133cb6e968a01dc36784a456 Mon Sep 17 00:00:00 2001
From: Seth Michael Larson <seth.larson@elastic.co>
Date: Wed, 2 Dec 2020 10:35:12 -0600
Subject: [PATCH] Add support for 'constant_keyword'

---
 elasticsearch_dsl/field.py           | 4 ++++
 test_elasticsearch_dsl/test_field.py | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/elasticsearch_dsl/field.py b/elasticsearch_dsl/field.py
index 6a1ed992a..6e79b4077 100644
--- a/elasticsearch_dsl/field.py
+++ b/elasticsearch_dsl/field.py
@@ -316,6 +316,10 @@ class Keyword(Field):
     name = "keyword"
 
 
+class ConstantKeyword(Keyword):
+    name = "constant_keyword"
+
+
 class Boolean(Field):
     name = "boolean"
     _coerce = True
diff --git a/test_elasticsearch_dsl/test_field.py b/test_elasticsearch_dsl/test_field.py
index 9c0c40237..2e8ec9689 100644
--- a/test_elasticsearch_dsl/test_field.py
+++ b/test_elasticsearch_dsl/test_field.py
@@ -172,6 +172,11 @@ def test_binary():
     assert f.deserialize(None) is None
 
 
+def test_constant_keyword():
+    f = field.ConstantKeyword()
+    assert f.to_dict() == {"type": "constant_keyword"}
+
+
 def test_object_dynamic_values():
     for dynamic in True, False, "strict":
         f = field.Object(dynamic=dynamic)