Recovery from red ES node and red indices

this weekend my server reached 100% disk space and caused all sorts of issues.
long story short, my most recent indices are all red now, and my node status is also red.
how do i recover from this? do i delete those red indices and will that just fix my node? how to proceed? thanks in advance

how about some files are remove from the node to make more rooms for the node? is it happened just a node or all nodes in the cluster?

i only have one node, i cleaned up the server and its working now. i had to wait for ES to slowly fix itself

one node has no fault tolerance, add two more nodes?