Cannot index using a specific ID

I tried to "Index Documents" with ID "4a343ca361d150e7-介護職".
It's seems Successful, but not appear in Documents.

Then, I tried to "Index Documents" with ID modified, here are the results.
"4a343ca361d150e7-介護" : appear in Documents (OK)
"4a343ca361d150e7--介護職" : appear in Documents (OK)
"a343ca361d150e7-介護職" : appear in Documents (OK)

What's wrong with ID "4a343ca361d150e7-介護職" ?