Check this thread out.
https://answers.splunk.com/answers/110173/search-peer-has-the-following-message-idx-internal-throttling-indexer-too-many-tsidx-files-in-bucket-dir-is-splunk-optimizer-running.html
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OK, Try this to see if it writes a log.:
msiexec.exe /i "splunkforwarder-x.x.x-xxxxx-x64-release.msi" ALLUSERS=1 /qn /norestart /log output.log AGREETOLICENSE=Yes
I had issues with several machines when using an auto-deployer like SCCM or PDQ Deply. I got back messages saying the product was already deployed, when it really wasn't.
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Add logging to your command to see why it's failing.
Try running:
msiexec.exe /i "c:\SFTPRoot\splunkforwarder-x.x.x-xxxx-x64-release.msi" /L C:\logfile.txt
Then evaluate the file.
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