Allow params to be added to FacetedSearches (#1500)

(cherry picked from commit 2e22e0a)

Author: reinbach

elasticsearch_dsl/faceted_search_base.py

@@ -425,6 +425,15 @@ def sort(self, search):
             search = search.sort(*self._sort)
         return search
 
+    def params(self, **kwargs):
+        """
+        Specify query params to be used when executing the search. All the
+        keyword arguments will override the current values. See
+        https://elasticsearch-py.readthedocs.io/en/master/api.html#elasticsearch.Elasticsearch.search
+        for all available parameters.
+        """
+        self._s = self._s.params(**kwargs)
+
     def build_search(self):
         """
         Construct the ``Search`` object.

tests/_async/test_faceted_search.py

@@ -192,3 +192,10 @@ def test_date_histogram_no_interval_keyerror():
     with pytest.raises(KeyError) as e:
         dhf.get_value_filter(datetime.now())
     assert str(e.value) == "'interval'"
+
+
+def test_params_added_to_search():
+    bs = BlogSearch("python search")
+    assert bs._s._params == {}
+    bs.params(routing="42")
+    assert bs._s._params == {"routing": "42"}

tests/_sync/test_faceted_search.py

@@ -192,3 +192,10 @@ def test_date_histogram_no_interval_keyerror():
     with pytest.raises(KeyError) as e:
         dhf.get_value_filter(datetime.now())
     assert str(e.value) == "'interval'"
+
+
+def test_params_added_to_search():
+    bs = BlogSearch("python search")
+    assert bs._s._params == {}
+    bs.params(routing="42")
+    assert bs._s._params == {"routing": "42"}