internal void WriteHeader(AbstractBufferedWriter writer)
{
FileCollectionWithFileInfos.WriteHeader(writer, _guid);
writer.WriteUInt8((byte)KVFileType.ModernKeyIndex);
writer.WriteVInt64(_generation);
writer.WriteVUInt32(_trLogFileId);
writer.WriteVUInt32(_trLogOffset);
writer.WriteVUInt64((ulong)_keyValueCount);
writer.WriteVUInt64(_commitUlong);
writer.WriteUInt8((byte) _compressionType);
}