What is the FT_IFTSHC_MUTEX wait type in SQL Server 2008 R2?

Question

I have seen some people include this wait type in their list of safe-to-ignore wait types, and they reference this blog as the source:

http://blogs.msdn.com/b/psssql/archive/2009/11/03/the-sql-server-wait-type-repository.aspx

But that blog doesn't say it is safe to ignore, it just says that is requires more research. I am working in a system that uses FTS extensively, so I am thinking this is a big issue with the overall slowness, but not sure.

Here is a ticket that says it is fixed and will be in the next version of BOL, but it isn't there yet. You would think someone could just say what it is:

https://connect.microsoft.com/SQLServer/feedback/details/351342/bol-missing-new-waittype-descriptions-in-sys-dm-os-wait-stats-help-item

Here are the top 5 waits I am seeing in the system:

Wait_type   wait_time_s pct running_pct signal_pct
FT_IFTSHC_MUTEX 126444.05   41.51   41.51   0.00
CXPACKET    47485.90    15.59   57.10   2.75
PAGEIOLATCH_SH  40947.25    13.44   70.54   0.20
TRACEWRITE  23805.03    7.82    78.36   0.91
BACKUPBUFFER    20058.78    6.59    84.94   2.66

Does anyone have a definitive answer on if I can ignore it, and if so, why?