For string body make sure we serialize unicode properly

elasticsearch/serializer.py

@@ -21,6 +21,10 @@ class JSONSerializer(object):
     def dumps(self, data):
         # don't serialize strings
         if isinstance(data, (type(''), type(u''))):
+            try:
+                return data.encode('utf-8')
+            except UnicodeDecodeError:
+                # Python 2 and str, no need to re-encode
                 return data
 
         try: