Automatic freeing of storage on /data

[chmey]

Is your feature request related to a problem? Please describe.
The /data partition may run low on space. It is vital to automatically free old data.

Describe the solution you'd like

• Periodically query the storage level and compare to threshold
• Run elastic-curator in a loop incrementing N while deleting the data from 30-N days ago
• After running the curator, check if the storage exhaustion has decreased to for example threshold-10% to avoid rerunning the curator soon again

Describe alternatives you've considered
Currently, the /data partition is monitored for exhaustion and elastic-curator has a fixed schedule for removing old documents. But it is not automated.

Additional context

• See also: actions.yml for elastic-curator