[Koha] Fatal error on rebuild...

Dear all, I was doing a rebuild for Koha 3.14 and I got the following error for the first time. I was able to do many successful rebuilds: 16:03:35-07/08 zebraidx(28684) [fatal] Write failed for file isambC part 0 [No space left on device] Can I know the reason of this error and how to solve it as now the search is not returning any results since the rebuild did not succeed? Thanks and regards.