Why is spotlight indexing not starting?

In spotlight, it states that it is estimating index time. This message never disappears.😐 In a similar thread, somebody was advised to post the following code into terminal;

syslog -k Sender mdworker -o -k Sender mds | grep -v boxd | tail | open -f -a TextEdit

The resulting text allowed the answerer to determine that there was a corrupt font file. I also put the code into terminal and this was the resulting text;

Jun 16 14:20:58 Jack-Elliotts-MacBook-Pro-2.local mds[41] <Error>: (Error) Backup: MDSBackupTask:0x0 Undispatched backup task:471111 resolved:0 cid:616950205797322:-1 finished:-1

Jun 18 15:39:16 Jack-Elliotts-MacBook-Pro-2.local mds[41] <Error>: (Error) Backup: MDSBackupTask:0x0 Undispatched backup task:17031201 resolved:0 cid:697273338727840:-1 finished:-1

Jun 18 15:39:32 Jack-Elliotts-MacBook-Pro-2.local mds[41] <Error>: (Error) Backup: MDSBackupTask:0x0 Undispatched backup task:16965667 resolved:0 cid:817539723702420:-1 finished:-1

Jun 18 15:46:51 Jack-Elliotts-MacBook-Pro-2.local mdworker[12505] <Warning>: CFPreferences: user home directory for user kCFPreferencesCurrentUser at /Users/Guest is unavailable. User domains will be volatile.

Jun 20 10:22:06 Jack-Elliotts-MacBook-Pro-2.local mds[41] <Error>: (Error) Backup: MDSBackupTask:0x0 Undispatched backup task:16957469 resolved:0 cid:817553925166352:-1 finished:-1

Jun 20 10:50:39 Jack-Elliotts-MacBook-Pro-2.local mds[41] <Error>: (Error) Server: ==== XPC handleXPCMessage XPC_ERROR_CONNECTION_INVALID

Can anybody help me find out what this means?

Message was edited by: jackelliott