switch current counters to gauges
switch current counters to gauges

in-flight counts should be gauges, not counters.
Also moved indexing to shared stats since applies to versions <1.

signalfx/collectd-elasticsearch,signalfuse/collectd-elasticsearch,botify-labs/collectd-elasticsearch,signalfx/collectd-elasticsearch,F4-Group/collectd-elasticsearch,botify-labs/collectd-elasticsearch,sfroment/collectd-elasticsearch,signalfx/collectd-elasticsearch,sfroment/collectd-elasticsearch,F4-Group/collectd-elasticsearch,signalfuse/collectd-elasticsearch