in src/main/java/com/microsoft/azure/kusto/kafka/connect/sink/TopicPartitionWriter.java [207:214]
String getFilePath(@Nullable Long offset) {
// Should be null if flushed by interval
offset = offset == null ? currentOffset : offset;
long nextOffset = fileWriter != null && fileWriter.isDirty() ? offset + 1 : offset;
return Paths.get(basePath, String.format("kafka_%s_%s_%d.%s%s", tp.topic(), tp.partition(), nextOffset,
ingestionProps.ingestionProperties.getDataFormat(), COMPRESSION_EXTENSION)).toString();
}