@Override
    @NotNull
    @JsonProperty
    @JsonPropertyDescription("The Open ID Connect claim used to link an identity on the IDP to a stroom user. " +
                             "Must uniquely identify the user on the IDP and not be subject to change. Uses 'sub' by " +
                             "default.")
    public String getUniqueIdentityClaim() {
        return uniqueIdentityClaim;
    }
@return The type of Open ID Connnect identity provider in use.
stroom-security/stroom-security-openid-api/src/main/java/stroom/security/openid/api/AbstractOpenIdConfig.java