Index update fails on Windows

```
What steps will reproduce the problem?
1. cindex any/path
2. cindex
3.

What is the expected output?
The index is updated.

What do you see instead?
After merging the master index with the updated index, the rename of
.csearchindex~~ to .csearchindex fail. This is possibly due to open file
handles.

What version of the product are you using? On what operating system?
Windows 7, 64 bit

Please provide any additional information below.

```

Original issue reported on code.google.com by `fuz...@gmail.com` on 23 Jan 2012 at 10:55

Empieza reproduciendo el fallo en Windows con `cindex any/path` seguido de `cindex`; después, inspecciona la ruta de combinación y renombrado del índice que involucra `.csearchindex~~` y `.csearchindex`. Se considera terminado cuando el renombrado se realiza sin errores por identificadores abiertos y el índice se actualiza.

Escrito por el modelo de indexación a partir del texto del issue.