David Pilato 80ca8e5ab6 Admin: add total index memory in _cat/indices
This patch adds to `_cat/indices` information about memory usage per index by adding memory used by FieldData, IdCache, Percolate, Segments (memory, index writer, version map).

```
% curl 'localhost:9200/_cat/indices?v&h=i,tm'
i     tm
wiki  8.1gb
test  30.5kb
user  1.9mb
```

Closes #7008
2014-10-08 13:38:00 +02:00
..