Better docstring for search_shards

Author: honzakral

elasticsearch/client/__init__.py

@@ -536,8 +536,10 @@ def search_shards(self, index=None, doc_type=None, params=None):
  out issues or planning optimizations with routing and shard preferences.
  `<http://www.elastic.co/guide/en/elasticsearch/reference/current/search-shards.html>`_
 
- :arg index: The name of the index
- :arg doc_type: The type of the document
+ :arg index: A comma-separated list of index names to search; use `_all`
+ or empty string to perform the operation on all indices
+ :arg doc_type: A comma-separated list of document types to search; leave
+ empty to perform the operation on all types
  :arg allow_no_indices: Whether to ignore if a wildcard indices
  expression resolves into no concrete indices. (This includes `_all`
  string or when no indices have been specified)