fix: missing network field in output (city, isp, anonymous)

[mcauto]

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I fixed the part that didn't work as expected according to the official documentation. plugins-filters-geoip.html#plugins-filters-geoip-field-mapping

I have identified the author of this document through this commit. Please check and confirm. @edmocosta https://github.com/logstash-plugins/logstash-filter-geoip/commit/a53f34b797cdf571f1fe163724af7e53def9b029

AS-IS

{
  "lite2_city": {
    "geo": {
      "region_iso_code": "KR-11",
      "city_name": "Songpa-gu",
      "country_iso_code": "KR",
      "timezone": "Asia/Seoul",
      "country_name": "South Korea",
      "continent_code": "AS",
      "location": { "lon": 0.0, "lat": 0.0 },
      "region_name": "Seoul",
      "postal_code": "055"
    },
    "ip": "{IPADDR}"
  },
  "country": {
    "geo": {
      "country_name": "South Korea",
      "continent_name": "Asia",
      "country_iso_code": "KR"
    },
    "ip": "{IP}"
  },
  "lite2_asn": {
    "as": { "number": 9318, "organization": { "name": "SK Broadband Co Ltd" } },
    "ip": "{IPADDR}"
  },
  "as": { "number": 9318, "organization": { "name": "SK Broadband Co Ltd" } },
  "anonymous_ip": {
    "ip_traits": {
      "residential_proxy": false,
      "anonymous": false,
      "tor_exit_node": false,
      "public_proxy": false,
      "hosting_provider": false,
      "anonymous_vpn": false
    }
  },
  "domain": { "domain": null },
  "ip": "{IPADDR}",
  "lite2_country": {
    "geo": {
      "country_name": "South Korea",
      "continent_name": "Asia",
      "country_iso_code": "KR"
    },
    "ip": "{IPADDR}"
  },
  "mmdb": { "organization": "SK Broadband", "isp": "SK Broadband" }
}

TO-BE

{
    "lite2_city": {
      "geo": {
        "region_iso_code": "KR-11",
        "city_name": "Songpa-gu",
        "country_iso_code": "KR",
        "timezone": "Asia/Seoul",
        "country_name": "South Korea",
        "continent_code": "AS",
        "location": { "lon": 0.0, "lat": 0.0 },
        "region_name": "Seoul",
        "postal_code": "055"
      },
      "ip_traits": { "network": "0.0.0.0/20" }, // add
      "ip": "0.0.0.0"
    },
    "country": {
      "geo": {
        "country_name": "South Korea",
        "continent_name": "Asia",
        "country_iso_code": "KR"
      },
      "ip": "0.0.0.0"
    },
    "lite2_asn": {
      "as": { "number": 9318, "organization": { "name": "SK Broadband Co Ltd" } },
      "ip": "0.0.0.0"
    },
    "anonymous_ip": {
      "ip_traits": {
        "tor_exit_node": false,
        "public_proxy": false,
        "anonymous_vpn": false,
        "residential_proxy": false,
        "anonymous": false,
        "hosting_provider": false,
        "network": "0.0.0.0/16" // add
      }
    },
    "city": {
      "geo": {
        "region_iso_code": "KR-11",
        "city_name": "Gwangjin-gu",
        "country_iso_code": "KR",
        "timezone": "Asia/Seoul",
        "country_name": "South Korea",
        "continent_code": "AS",
        "location": { "lon": 0.0, "lat": 0.0 },
        "region_name": "Seoul",
        "postal_code": "050"
      },
      "ip_traits": { "network": "0.0.0.0/24" },
      "ip": "0.0.0.0"
    },
    "domain": { "domain": null },
    "isp": {
      "as": { "number": 9318, "organization": { "name": "SK Broadband Co Ltd" } },
      "mmdb": { "organization": "SK Broadband", "isp": "SK Broadband" },
      "ip_traits": { "network": "0.0.0.0/24" }, // add
      "ip": "0.0.0.0"
    },
    "lite2_country": {
      "geo": {
        "country_name": "South Korea",
        "continent_name": "Asia",
        "country_iso_code": "KR"
      },
      "ip": "0.0.0.0"
    }
  }

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