anchor.diff:  node connections must close and re-open, which can cause in-flight requests to
   fail.
   
  -A remote cluster can be deleted from the cluster settings by setting its settings to `null` :
  +You can delete a remote cluster from the cluster settings by passing `null`
  +values for each remote cluster setting:
   
   [source,console]
   --------------------------------
  
positive.code:   <<configuring-tls,TLS is enabled>>. The TLS transport will fail to open
    remote connections if this field is not a valid hostname as defined by the
    TLS SNI specification.
  
  [discrete]
  [[retrieve-remote-clusters-info]]
  === Retrieving remote clusters info
  
  You can use the <<cluster-remote-info, remote cluster info API>> to retrieve
  information about the configured remote clusters, as well as the remote nodes
  that the node is connected to.
  
negative.code: [[modules-remote-clusters]]
  == Remote clusters
  
  You can connect a local cluster to other {es} clusters, known as _remote
  clusters_. Once connected, you can search remote clusters using
  <<modules-cross-cluster-search,{ccs}>>. You can also sync data between clusters
  using <<xpack-ccr,{ccr}>>.
  
  To register a remote cluster, connect the local cluster to nodes in the
  remote cluster using one of two connection modes:
  
  * <<sniff-mode,Sniff mode>>
  * <<proxy-mode,Proxy mode>>
  
  Your local cluster uses the <<modules-transport,transport layer>> to establish
  communication with remote clusters. The coordinating nodes in the local cluster
  establish <<long-lived-connections,long-lived>> TCP connections with specific
  nodes in the remote cluster. {es} requires these connections to remain open,
  even if the connections are idle for an extended period.
  
  You can use the <<cluster-remote-info, remote cluster info API>> to get
  information about registered remote clusters.
  
  [[sniff-mode]]
  [discrete]
  ==== Sniff mode
  
  In sniff mode, a cluster is created using a name and a list of seed nodes. When
  a remote cluster is registered, its cluster state is retrieved from one of the
  