LocalBufferFile getRecoveryChangeSetFile() throws IOException {
		if (recovered && recoveryHasChangeSet) {
			return new LocalBufferFile(changeFiles[snapshotIndex], true);
		}
		return null;
	}
Returns the recovery change data file for reading or null if one is not available.
The caller must dispose of the returned file before peforming generating any new
recovery snapshots.
@throws IOException
Ghidra/Framework/DB/src/main/java/db/buffers/RecoveryMgr.java