http://fhir.patientsknowbest.com/operation/group
https://www.hl7.org/fhir/STU3/operationdefinition.html
https://www.hl7.org/fhir/STU3/operations.html
"group"
"active"
"operation"
There are some use cases for which it is a helpful optimisation to group the search results based on some criteria, and then return only a limited number of those results.
An existing example of this is the $lastn operation.
More general grouping behaviour can be achieved by using the custom $group operation (for supported endpoints).
The supported search parameters match those for Observation search.
By default, this query will group results by day, and return only one result per day.
true
"group"
"Observation"
false
true
false