It becomes Frozen buckets.
Data rolled from cold. The indexer deletes frozen data by default, but you can also archive it. Archived data can later be thawed.
Thanks. So this mean if I set the maximum size of my index correct, I shouldn't run out of disk space. Right?
If you run out of disk space, the indexer stops indexing.
Please read the description of indexes.conf for the parameters to be set.