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Search for all records that don't have a value for a specific field

If the records that are needed from a query are all of those where a specific characteristic hasn't been populated, the query needs to combine a $not query with a $range query where the range is all possible values ( * TO * ). For example, to find all rights that don't have an end_date set:
POST - https://ris.rightsline.com/v4/right/search
{
"query": {
"$not": [
{
"$range": [
"end_date",
"*",
"*"
]
}
]
}
}