: sessionAvailableNowQuery = {!edismax}(start_time:[* TO : 1970-01-01T12:37:030Z] AND end_time:[1970-01-01T12:37:030Z + : (_val_:order_prep_time)MINUTES TO *] AND consumers:[1 TO *] AND : session_time_range_available:true)
you can't embed the valuef of a field inside a query string like that (the "_val_" hook only lets you embed a function in a place where a query clause would normally be expected) : Is it possible to retrive an integer value from the index and pass it on it : a date math query ? Is there anything else that needs to be in the query ? not using the date match syntax, but you can use the function syntax to write a function that performs a math equation in which two indexed fields are the input - and there is an "ms()" function which can be used to get the milliseconds since epoch from a date value (either in an indexed field or a date match expression), or the diff in milliseconds between two date values. so you should be able to do something like this (untested) in a function which should return a positive value if "end_time" is at least "order_prep_time" minutes past your input date... sub(ms(end_time, 1970-01-01T12:37:030Z), product(order_prep_time,60000)) ..and then you can use that function in the frange parser to only match documents with positive values... fq={frange l=0}sub(ms(end_time,1970-01-01T12:37:030Z),product(order_prep_time,60000)) -Hoss