Elasticsearch integration: every field is sent as String

[enoquefcd]

When moskito-central sends the producers information to elasticSearch (using v5.6.12), every field reaches elasticSearch as a String field, including number and date fields, which makes it basicly useless because kibana can't make any countable visualization over String fields. I don't know if elasticsearch requires us to send the fields with a specified type along with the field, or if its just a case of sending : 123 instead of "123" on the json fields.

EDIT: I just noticed that just sending 123 instead of "123" on the request json to elasticsearch is enough, for a provisory solution, I just edited the ElasticsearchStorage.httpProcessSnapshot() method to convert the stats to Map<String, Object> instead of Map<String, String>, and convert the number strings to bigdecimal,, then the gson.toJson() will convert the types correctly,,, ill try this soon for dates too