Fixed regression introduced in Terms query class (#1907)

(cherry picked from commit 8a72af9)

Author: miguelgrinberg

Diff for: elasticsearch_dsl/query.py

@@ -551,7 +551,10 @@ class Terms(Query):
     name = "terms"
 
     def _setattr(self, name: str, value: Any) -> None:
-        super()._setattr(name, list(value))
+        # here we convert any iterables that are not strings to lists
+        if hasattr(value, "__iter__") and not isinstance(value, (str, list)):
+            value = list(value)
+        super()._setattr(name, value)
 
 
 class TermsSet(Query):

Diff for: tests/test_query.py

@@ -81,8 +81,8 @@ def test_terms_to_dict() -> None:
     assert {"terms": {"_type": ["article", "section"]}} == query.Terms(
         _type=["article", "section"]
     ).to_dict()
-    assert {"terms": {"_type": ["article", "section"]}} == query.Terms(
-        _type=("article", "section")
+    assert {"terms": {"_type": ["article", "section"], "boost": 1.1}} == query.Terms(
+        _type=("article", "section"), boost=1.1
     ).to_dict()