anchor.diff:      (integer)
       Number of failed operations for the processor.
   
  -
   [[cluster-nodes-stats-api-response-body-adaptive-selection]]
   ===== `adaptive_selection` section
   
  -The `adaptive_selection` flag can be set to retrieve statistics that concern
  -<<search-adaptive-replica,adaptive replica selection>>. These statistics are
  -keyed by node. For each node:
  +The `adaptive_selection` statistics are keyed by node. For each node:
   
   `adaptive_selection.outgoing_searches`::
       The number of outstanding search requests from the node these stats are for 
  
positive.code: 
  [[cluster-nodes-stats-api-response-body-os]]
  ===== `os` section
  
  The `os` flag can be set to retrieve statistics that concern
  the operating system:
  
  `os.timestamp`::
      Last time the operating system statistics have been refreshed.
  
negative.code: ++++
  
  Returns cluster nodes statistics.
  
  [[cluster-nodes-stats-api-request]]
  ==== {api-request-title}
  