anchor.diff:  
   This REST access pattern is so pervasive throughout all the API commands that if you can simply remember it, you will have a good head start at mastering Elasticsearch.
   
  +[[getting-started-modify-data]]
   == Modifying Your Data
   
   Elasticsearch provides data manipulation and search capabilities in near real time. By default, you can expect a one second delay (refresh interval) from the time you index/update/delete your data until the time that it appears in your search results. This is an important distinction from other platforms like SQL wherein data is immediately available after a transaction is completed.
  
positive.code: 
  With that out of the way, let's get started with the fun part...
  
  == Installation
  
  [TIP]
  
negative.code: It is worth noting that it is much more efficient to delete a whole index
  instead of deleting all documents with the Delete By Query API.
  
  [[getting-started-batch-processing]]
  === Batch Processing
  
  In addition to being able to index, update, and delete individual documents, Elasticsearch also provides the ability to perform any of the above operations in batches using the {ref}/docs-bulk.html[`_bulk` API]. This functionality is important in that it provides a very efficient mechanism to do multiple operations as fast as possible with as few network roundtrips as possible.
  