anchor.diff:  Defaults to 100. 
   end::scroll_size[]
   
  -tag::segment-search[]
  -If `true`,
  -the segment is searchable.
  -+
  -If `false`,
  -the segment has most likely been written to disk
  -but needs a <<indices-refresh,refresh>> to be searchable.
  -end::segment-search[]
  -
   tag::search_timeout[]
   `search_timeout`::
   (Optional, <<time-units, time units>> Explicit timeout for each search 
  
positive.code: of the shard.
  end::segment[]
  
  tag::settings[]
  `settings`::
  (Optional, <<index-modules-settings,index setting object>>) Configuration
  
negative.code: 
  tag::preference[]
  `preference`::
  (Optional, string) Specifies the node or shard the operation should be 
  performed on. Random by default.
  end::preference[]
  
  tag::search-q[]
  