Confluence index files copy

Dear Support Team,

At the path of /var/confluence/index/plugin/usage, I can find index file as listed as below:

-23*92.fdt,

-23*92.fdx

-23*92.fnm

-23*92.frq

-23*92.nrm

-23*92.prx

-23*92.tii

-23*92.tis

-23*92.cfs

-23y6g.cfs

-23y6h.cfs

segments_1kzp0

segments.gen
Because I try use program to automatically to copy index files to my local computer, but index files are not complete. How can I make sure index files =13 , and then I can do copy action ? Thanks a lot.