The bloom filter is a data structure used by Splunk to accelerate searches by quickly identifying which index buckets might contain relevant events. This file, named bloomfilter, is a component of each index bucket. It resides at the top level of the bucket's directory structure. The path provided in option A, $SPLUNKHOME/var/lib/splunk/indexfoo/db/db..., represents the specific directory for a warm/cold bucket within the 'indexfoo' index, which is precisely where the bloomfilter file is located.

B. $SPLUNKHOME/var/lib/splunk/indexfoo/db/db155350485815535045078/.tsidx

This path points to the time-series index files (.tsidx), which contain the lexicon and postings lists, not the bloom filter.

C. $SPLUNKHOME/var/lib/splunk/fishbucket

The fishbucket directory tracks the read-state of monitored input files to prevent re-indexing; it is unrelated to index buckets or bloom filters.

D. $SPLUNKHOME/var/lib/splunk/indexfoo/db/db155350485815535045078/rawdata

This directory contains the compressed raw event data (journal.gz), not metadata files like the bloom filter.

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1. Splunk Enterprise Documentation. (2023). Managing Indexers and Clusters of Indexers, Version 9.1.1. "How Splunk stores indexes". In the subsection "Bucket anatomy," the bloomfilter file is explicitly listed as a component within a bucket's main directory. The path structure shown ($SPLUNKHOME/var/lib/splunk///) directly corresponds to the path in option A.

2. Splunk Enterprise Documentation. (2023). Getting Data In, Version 9.1.1. "How the fishbucket works". This section details the purpose of the fishbucket for tracking input file pointers, confirming it is not related to index data structures like bloom filters.