I'm doing some experimentation on my Mac. I have no data in ES. I create an index and add a few small documents (using the python elasticsearch_dsl library).
I then get this in the stderr after a few documents successfully get indexed:
[2019-03-15T17:50:45,215][WARN ][o.e.c.r.a.DiskThresholdMonitor] [qEP99z5] flood stage disk watermark [95%] exceeded on [qEP99z5lRXqLTZ3oNljwqQ][qEP99z5][/usr/local/var/lib/elasticsearch/nodes/0] free: 24.9gb[2.6%], all indices on this node will be marked read-only
I don't know how to adjust the following settings to get this to stop. I have 100 GB free on my laptop.
cluster.routing.allocation.disk.watermark.flood_stage: 95% cluster.routing.allocation.disk.watermark.low: 85% cluster.routing.allocation.disk.watermark.high: 90%
Ideally, if I could index about 10GB of data, I'd be happy.