metric_value_number may become integer and doubles lose fractions

[mserdur]

If the first metric_value_number is an integer, elastic search creates the mapping type as an integer and keeps using the same type for double metrics too. This is especially very bad for the ones which are between 0 and 1, like the cpu metrics.
Maybe it can be a good idea to create 2 separate fields for numbers fields: "metric_value_long" and "metric_value_double".