@dangerousbeans what sort of reduce do you want to do? Can you express it using map-filter-reduce query (as supported by flumeview-query)

@dominic oh wait I misread

The second index created a object of key value pairs between a position string 'x/y' and a timestamp of the last activity there

{ 
  '8/16': 1555845604139,
  '17/28': 1555885265908,
  '7/14': 1557345877396 
}