Do not raise KeyError on Indices.get_indices

On an index recently created, index metadata can not be ready in ES (for
example, a logstash index being created by the current stack).
get_indices method should not fail, especially if include_aliases is
False.

pyes/managers.py

@@ -218,11 +218,14 @@ def get_indices(self, include_aliases=False):
         indices_metadata = state['metadata']['indices']
         for index in sorted(indices_status.keys()):
             info = indices_status[index]
-            metadata = indices_metadata[index]
             num_docs = info['docs']['num_docs']
             result[index] = dict(num_docs=num_docs)
             if not include_aliases:
                 continue
+            try:
+                metadata = indices_metadata[index]
+            except KeyError:
+                continue
             for alias in metadata.get('aliases', []):
                 try:
                     alias_obj = result[alias]