In the right pane of the Dashboard, an entry for each configured search index displays. The name, index state, index status and last rebuild start time is shown for each index along with an icon that indicates the overall state of the index.
The 
icon indicates
a status of good, meaning an index is open, and a rebuild succeeded
or is in progress.
The 
icon indicates
an index was manually closed.
The 
icon indicates
an index was unloaded after a period of inactivity.
The 
icon indicates an index failed
to rebuild or the index state is not open on any server.
To display index details, complete the following step.
On the Dashboard, in the Indexes pane,
click the name of the index that you want to view.