anchor.diff:  [[cluster-nodes-stats-api-response-body]]
   ==== {api-response-body-title}
   
  +[[cluster-nodes-stats-api-response-body-fs]]
  +===== `fs` section
  +
   The `fs` flag can be set to retrieve information that concern the file system:
   
   `fs.timestamp`::
  
positive.code:     Size in bytes of virtual memory that is guaranteed to be available to the 
      running process.
  
  The `ingest` flag can be set to retrieve statistics that concern ingest:
  
  `ingest.total.count`::
      The total number of document ingested during the lifetime of this node
  
  `ingest.total.time_in_millis`::
      The total time spent on ingest preprocessing documents during the lifetime 
      of this node.
  
  `ingest.total.current`::
      The total number of documents currently being ingested.
  
  `ingest.total.failed`::
      The total number ingest preprocessing operations failed during the lifetime 
      of this node.
  
  On top of these overall ingest statistics, these statistics are also provided on 
  a per pipeline basis.
  
  The `adaptive_selection` flag can be set to retrieve statistics that concern
  <<search-adaptive-replica,adaptive replica selection>>. These statistics are
  
negative.code: kernel, the `cpu` and `cpuacct` cgroup subsystems must be configured and stats 
  must be readable from `/sys/fs/cgroup/cpu` and `/sys/fs/cgroup/cpuacct`.
  
  
  [[cluster-nodes-stats-api-response-body-process]]
  ===== `process` section
  
  The `process` flag can be set to retrieve statistics that concern
  the current running process:
  
  