Provide elasticsearch mapping

[dadoonet]

Until now the mapping is not pushed to elasticsearch so elasticsearch uses dynamic mapping to auto guess field formats.

Each time the index is created, we should:

• read the mapping from disk, ideally one file per type
• if exists, push the mapping in the new created index

We might not want to use templates here as we want to be able easily to change the mappings easily.

[dadoonet]

@ycombinator offered his help on this