Deployment Architecture

Health indicator red: Index Processor -> Buckets - Maybe "Failed to remove summary of" ... ? but files are not present

Engager

Hi everyone,

I have a problem with an Indexer. Inside the Health Indicator (the small icon beside the username) the "Health Status of Splunkd" indicates a severe Error: "Index Processor -> Buckets".
The HealthIndicator itself doesn't provide any other help or information.
Neither the ManagementConsole, nor the Masternode does know something about this issue. Everything there is "green".

The only thing I found in the _internal regarding the problematic host(Indexer) was:
01-28-2019 xx:xx:34.770 +0100 ERROR DatabaseDirectoryManager - Failed to remove summary of bid=_internal~XXXX~XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX with cid="dma|_internal~XXXX~XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX|XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX_XX_Splunk_XX_XXX_XXXXXXXX.YYYYYYYYY" from summary manager, skipping remove.

The permissions in the folders (on the linux machine allow deleting)

total 208
drwx--x--- 3 splunk splunk 8192 Dec 7 2017 .
drwx------ 271 splunk splunk 135168 Jan 28 11:00 ..
-rw------- 1 splunk splunk 31827 Dec 7 2017 XXXXXXXXXX-XXXXXXXXXX-XXXXXXXXXXXXXXXXXXX.tsidx
-rw------- 1 splunk splunk 1183 Dec 7 2017 bloomfilter
-rw------- 1 splunk splunk 75 Dec 7 2017 bucket_info.csv
-rw------- 1 splunk splunk 99 Dec 7 2017 Hosts.data
-rw------- 1 splunk splunk 0 Dec 7 2017 optimize.result
drwx------ 2 splunk splunk 4096 Dec 7 2017 rawdata
-rw------- 1 splunk splunk 6 Dec 7 2017 .rawSize
-rw------- 1 splunk splunk 5 Dec 7 2017 .sizeManifest4.1
-rw------- 1 splunk splunk 101 Dec 7 2017 Sources.data
-rw------- 1 splunk splunk 105 Dec 7 2017 SourceTypes.data
-rw------- 1 splunk splunk 254 Dec 7 2017 Strings.data

Could the log entry belong to the issue? How can I clean/repair up the summary? The files aren't present any more. So of cause the files can't be deleted
Thanks for your reply.