Update expected shard count

This was changed in pelias/config#60 to match
the Elasticsearch default. It helps people who use the defaults to be
able to scale a little bit further out of the box.

test/fixtures/expected.json

@@ -1566,7 +1566,7 @@
     },
     "index": {
       "number_of_replicas": "999",
-      "number_of_shards": "1",
+      "number_of_shards": "5",
       "refresh_interval": "1m"
     }
   },

test/settings.js

@@ -450,7 +450,7 @@ module.exports.tests.index = function(test, common) {
     var s = settings();
     t.equal(typeof s.index, 'object', 'index specified');
     t.equal(s.index.number_of_replicas, "0", 'replicas will increase index time');
-    t.equal(s.index.number_of_shards, "1", 'sharding is only required in a distributed env');
+    t.equal(s.index.number_of_shards, "5", 'sharding value should use the elasticsearch default');
     t.end();
   });
 };