Remove reference to fs.data.spins in docs
We long ago removed fs.data.spins from the nodes stats. This commit
removes reference to this in the docs.
@@ -123,11 +123,6 @@ information that concern the file system:
`fs.data.available_in_bytes`::
Total number of bytes available to this Java virtual machine on this file store
-`fs.data.spins` (Linux only)::
- Indicates if the file store is backed by spinning storage.
- `null` means we could not determine it, `true` means the device possibly spins
- and `false` means it does not (ex: solid-state disks).
-
`fs.io_stats.devices` (Linux only)::
Array of disk metrics for each device that is backing an
Elasticsearch data path. These disk metrics are probed periodically
