We are indexing metrics that arrive to logstash in json format
There is a value "MeasurementDate" that can either:
- be missing
- has null value
- has date value (iso8601)
When field has valid value or is missing - we need to index this event
When field has value of null - we need to drop this event
Is there any way to differentiate between missing field and field with a value of null/nil?