Updated readme related to Big ANN attributes

aerospike/README.md

@@ -495,9 +495,9 @@ The arguments are:
 - \--hdf HDFFILE – The name of the HDF5 file that will be created in the “data” folder. This file will have the following attributes:
  - dimension – The dimensions of the training vector as defined by the Big ANN dataset
  - distance – The distance type
- - nbrneighbors -- The number of neighbors returned
+ - defaultsearchcount-- The default search count as defined by Big ANN
  - point_type – The point type
- - searchtype – The distance search type
+ - metrictype– The metric type used to calculate distance. Currently only support “KNN”. This is associated to the “search type” in Big ANN.
  - sourcedataset – The Big ANN dataset name
  - type – Always "dense"
  - distances – A collection of vectors and shape of the test results distances as defined in the Big ANN dataset