the arguments in the documentation for aggregation rules appear to be invalid due to ambiguous use of nested bullets.

documentation suggests all the following fields are configured as such:

• mapping - (Optional) The map of record values to severities to use in the "fieldValueMapping" case
• type - (Required) Must be set to "eq" currently
• from - (Required) The record value to map from
• to - (Required) The severity value to map to

when the fields "type" "from" and "to" are nested under "mapping"

• mapping - (Optional) The map of record values to severities to use in the "fieldValueMapping" case
  • type - (Required) Must be set to "eq" currently
  • from - (Required) The record value to map from
  • to - (Required) The severity value to map to

https://registry.terraform.io/providers/SumoLogic/sumologic/latest/docs/resources/cse_aggregation_rule