Each document store’s collection of index stripes contain exactly zero or one active index stripe. An active index stripe is a collection of RAM-oriented data structures–all of its data is stored in RAM while it keeps a copy on disk for persistence. An active index stripe is always writable, thus may contain data collected over numerous indexing sessions.
The active index stripe persists its data in three compressed files–the <ais-version-ID> is incremented each time the active index stripe is updated:
ais-dat-<ais-version-ID>.ser.gz
ais-del-<ais-version-ID>.ser.gz
ais-len-<ais-version-ID>.ser.gz
When an active index stripe is emptied into a static index stripe, these files are deleted.
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