anchor.diff:  * sets bulkSize to `5mb`
   * does not set flushInterval
   * sets concurrentRequests to 1
  +* sets backoffPolicy to an exponential backoff with 8 retries and a start delay of 50ms. The total wait time is roughly 5.1 seconds.
   
   When all documents are loaded to the `BulkProcessor` it can be closed by using `awaitClose` or `close` methods:
   
  
positive.code: 
  [source,java]
  --------------------------------------------------
  import org.elasticsearch.action.bulk.BulkProcessor;
  import org.elasticsearch.common.unit.ByteSizeUnit;
  import org.elasticsearch.common.unit.ByteSizeValue;
  
negative.code:         .setBulkSize(new ByteSizeValue(1, ByteSizeUnit.GB)) <6>
          .setFlushInterval(TimeValue.timeValueSeconds(5)) <7>
          .setConcurrentRequests(1) <8>
          .setBackoffPolicy(
              BackoffPolicy.exponentialBackoff(TimeValue.timeValueMillis(100), 3)) <9>
          .build();
  --------------------------------------------------
  <1> Add your elasticsearch client
  