See if this works:
Open the DMC, click on menu called "settings" -> general setup -> edit next to the indexer -> disable monitoring
It gets more interesting...
The "Overview" page shows 18 indexers and 12 unreachable (the 12 that I decommed via "offline"). The general setup page does not show them at all. I went into the "managementconsole_overview" view, and it lists the following:
<?xml version="1.0"?> <view template="pages/app.html" type="html"> <label>Overview</label> </view>
I looked for that html page under ../etc, but found nothing. Thoughts?
you need to disable it as search peer Settings / Distributed search / Search peers
then you need to remove it from dmc settings" -> general setup -> edit next to the indexer -> disable monitoring
I had the same problem but runnign all steps again it worked
1 - Open the DMC -> Settings -> General Setup -> Edit next to the indexer -> Disable monitoring
2 - Restart Master server
3 - Apply Changes on DMC -> Settings -> General Setup