Reload occurs when:
You add a new sourcetype in props.conf.
You add or update any TRANSFORMS- stanzas in props.conf.
You add any new stanzas in transforms.conf.
You make any of these changes in indexes.conf:
Adding new index stanzas
Enabling or disabling an index with no data
Changing any attributes not listed as requiring restart
Restart occurs when:
The configuration bundle contains changes to any configuration files besides indexes.conf, props.conf, or transforms.conf.
You make any changes to props.conf or transforms.conf, other than those specified in the reload list, above.
You make any of these indexes.conf changes:
Adding or removing a volume
Enabling or disabling an index with data
Removing an index
Changing any of these attributes: homePath, coldPath, thawedPath, bloomHomePath, summaryHomePath, tstatsHomePath, repFactor, rawChunkSizeBytes, minRawFileSyncSecs, syncMeta, maxConcurrentOptimizes, coldToFrozenDir
http://docs.splunk.com/Documentation/Splunk/6.2.5/Indexer/Updatepeerconfigurations#Restart_or_reload_after_configuration_bundle_changes.3F
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