update elastic struct tag. tags should be space separated, not comma
update elastic struct tag. tags should be space separated, not comma

raintank/raintank-metric,OOM-Killer/metrictank,replay/metrictank,raintank/metrictank,replay/metrictank,raintank/metrictank,OOM-Killer/metrictank,raintank/metrictank,OOM-Killer/metrictank,raintank/metrictank,replay/metrictank,raintank/raintank-metric,replay/metrictank,raintank/raintank-metric