The IndexFileNames type exposes the following members.
Fields
| Name | Description | |
|---|---|---|
  | COMPOUND_EXTENSIONS | File extensions of old-style index files |
| COMPOUND_FILE_EXTENSION | Extension of compound file |
| COMPOUND_FILE_STORE_EXTENSION | Extension of compound file for doc store files |
| DELETABLE | Name of the index deletable file (only used in
pre-lockless indices)
|
| FIELD_INFOS_EXTENSION | Extension of field infos |
| FIELDS_EXTENSION | Extension of stored fields file |
| FIELDS_INDEX_EXTENSION | Extension of stored fields index file |
| FREQ_EXTENSION | Extension of freq postings file |
| GEN_EXTENSION | Extension of gen file |
| INDEX_EXTENSIONS | This array contains all filename extensions used by
Lucene's index files, with two exceptions, namely the
extension made up from  CopyC#.f CopyC#.s CopyC#segments_N |
| INDEX_EXTENSIONS_IN_COMPOUND_FILE | File extensions that are added to a compound file
(same as above, minus "del", "gen", "cfs").
|
| NON_STORE_INDEX_EXTENSIONS | |
| NORMS_EXTENSION | Extension of norms file |
| PLAIN_NORMS_EXTENSION | Extension of plain norms |
| PROX_EXTENSION | Extension of prox postings file |
| SEGMENTS | Name of the index segment file |
| SEGMENTS_GEN | Name of the generation reference file name |
| SEPARATE_NORMS_EXTENSION | Extension of separate norms |
| STORE_INDEX_EXTENSIONS | |
| TERMS_EXTENSION | Extension of terms file |
| TERMS_INDEX_EXTENSION | Extension of terms index file |
| VECTOR_EXTENSIONS | File extensions for term vector support |
| VECTORS_DOCUMENTS_EXTENSION | Extension of vectors documents file |
| VECTORS_FIELDS_EXTENSION | Extension of vectors fields file |
| VECTORS_INDEX_EXTENSION | Extension of vectors index file |
