code: public ReadOperation<BsonDocument> asExplainableOperation(final ExplainVerbosity explainVerbosity) {
          return new AggregateExplainOperation(getNamespace(), getPipeline())
                 .allowDiskUse(getAllowDiskUse())
                 .maxTime(getMaxAwaitTime(TimeUnit.MILLISECONDS), TimeUnit.MILLISECONDS)
                 .hint(wrapped.getHint())
                 .retryReads(getRetryReads());
      }
docs: Gets an operation whose execution explains this operation.
  
  @param explainVerbosity the explain verbosity
  @return a read operation that when executed will explain this operation