Apply suggestions from code review

Author: yaauie

CHANGELOG.md

@@ -1,6 +1,6 @@
 ## 7.2.11
  - Improved compatibility with the Elastic Common Schema [#206](https://github.com/logstash-plugins/logstash-filter-geoip/pull/206)
-   - Added support for ECS's composite `region_iso_code`
+   - Added support for ECS's composite `region_iso_code` (`US-WA`), which _replaces_ the non-ECS `region_code` (`WA`) as a default field with City databases. To get the stand-alone `region_code` in ECS mode, you must include it in the `fields` directive. 
    - [DOC] Improve ECS-related documentation
 
 ## 7.2.10

src/main/java/org/logstash/filters/geoip/GeoIPFilter.java

@@ -317,6 +317,7 @@ private Map<Fields,Object> retrieveCityGeoData(InetAddress ipAddress) throws Geo
           if (countryCodeForRegion != null && regionCode2 != null) {
             geoData.put(Fields.REGION_ISO_CODE, String.format("%s-%s", countryCodeForRegion, regionCode2));
           }
+          break;
         case TIMEZONE:
           String locationTimeZone = location.getTimeZone();
           if (locationTimeZone != null) {