Hi Marco Perazzo, I'm running your same query, and the output I'm getting generated is:

{"range":{"createdAt":{"gte":1478789928000}}}

I'm not finding any sign of it using the scientific notation; I tested both the current master and version 5.6.0.Beta3. Is it possible you're running some slightly different version of gson? Maybe some other dependency is overriding the version we use?

Also, your numeric range query is targeting the field "createdAt", but your output query is naming field "updatedAt". Are we looking at the right problem?