Fix typo
Make indexName more generic
Add filesize to indexed document
Source: https://groups.google.com/forum/?hl=fr&fromgroups=#!searchin/elasticsearch/fsriver$20size/elasticsearch/uks2Zbc4iKU/e1DL9MYrht8J

We want to add the filesize as an attribute of the generated document.

It will be added by default. Can be removed using `add_filesize: false`.
Closes #18
Remove spaces