SegName
SegID
SegCodec
DelGen
DeletionCount
FieldInfosGen
DocValuesGen
SoftDelCount
FieldInfosFiles
UpdatesFiles
Header
LuceneVersion
IndexCreatedVersionMajor
Version
NameCounter
SegCount
MinSegmentLuceneVersion
SegmentCommitInfo
CommitUserData
Footer
索引文件segments_3
以_2为前缀的段
Header
SegVersion
SegSize
IsCompoundFile
Diagnostics
Files
Attributes
IndexSort
Footer
索引文件_2.si
_2.cfe、_2.cfs
