Adding RankFeature and RankFeature

thank you, @inkhey!

Author: honzakral

elasticsearch_dsl/field.py

@@ -309,6 +309,9 @@ def __init__(self, scaling_factor, *args, **kwargs):
 class Double(Float):
     name = 'double'
 
+class RankFeature(Float):
+    name = 'rank_feature'
+
 class Integer(Field):
     name = 'integer'
     _coerce = True

elasticsearch_dsl/query.py

@@ -286,6 +286,9 @@ class FuzzyLikeThis(Query):
 class FuzzyLikeThisField(Query):
     name = 'fuzzy_like_this_field'
 
+class RankFeature(Query):
+    name = 'rank_feature'
+
 class DistanceFeature(Query):
     name = 'distance_feature'