Cannot search by _security

[szymonp-kainos]

Fhir states that every resource can by searched by _security but fhirbase returns error while doing so

SELECT fhir_search('{"resourceType": "Patient", "queryString": "_security=Location"}');

returns

ERROR:  Error: No parser for special - security
DETAIL:  plv8_init() LINE 4012:           throw new Error("No parser for special - " + key);

Tested on fhirbase v1.3.0.23