@Override
        public void accept(final String fieldName, final Object fieldValue) {
            source.put(getPhysicalColumnName(modelName, fieldName)
                , fieldValue);
        }
ElasticSearchConverter same as the HashMapConverter, but translate the column alias automatically.
oap-server/server-storage-plugin/storage-elasticsearch-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch/base/ElasticSearchConverter.java