Document the available databases and fields

Author: joegallo

docs/reference/ingest/processors/ip-location.asciidoc

@@ -79,7 +79,20 @@ depend on what has been found and which properties were configured in `propertie
 `location`, `accuracy_radius`, `country_confidence`, `city_confidence`, `postal_confidence`, `asn`, `organization_name`, `network`,
 `hosting_provider`, `tor_exit_node`, `anonymous_vpn`, `anonymous`, `public_proxy`,
 `residential_proxy`, `domain`, `isp`, `isp_organization_name`, `mobile_country_code`, `mobile_network_code`, `user_type`, and
-`connection_type`. The fields actually added depend on what has been found and which properties were configured in `properties`.
+`connection_type`. The fields actually added depend on what has been found and which properties were configured in `properties`
+* If the IPinfo ASN database is used, then the following fields may be added under the `target_field`: `ip`,
+`asn`, `organization_name`, `network`, `domain`, `country_iso_code`, and `type`. The fields actually added depend on what
+has been found and which properties were configured in `properties`. Note also that `country_iso_code` and `type` fields
+are only present in the 'Standard ASN' database, not the free ASN database.
+* If the IPinfo Country database is used, then the following fields may be added under the `target_field`: `ip`,
+`country_iso_code`, `country_name`, `continent_code`, and `continent_name`. The fields actually added depend on what
+has been found and which properties were configured in `properties`.
+* If the IPinfo IP to Location database is used, then the following fields may be added under the `target_field`: `ip`,
+`country_iso_code`, `region_name`, `city_name`, `timezone`, `postal_code`, and `location`. The fields actually added depend on what
+has been found and which properties were configured in `properties`.
+* If the IPinfo Privacy Detection database is used, then the following fields may be added under the `target_field`: `ip`,
+`hosting`, `proxy`, `relay`, `tor`, `vpn`, and `service`. The fields actually added depend on what
+has been found and which properties were configured in `properties`.
 
 Here is an example that uses the default city database and adds the geographical information to the `ip_location` field based on the `ip` field: