map reduce on multiple buckets

Eugene Shubin ev.shuba at
Thu Jan 28 08:10:25 EST 2016

Is it possible to run mapreduce job on two or more buckets?
I see from documentation that it might be possible if I specify inputs as
list of {bucket, key} pairs,
although list of secondary index inputs causes an error:
riakc_pb_socket:mapred(P, [
    {index, Bucket1, Index1, From, To},
    {index, Bucket2, Index2, From, To}
  ], ...
 {error,<<"{inputs,{\"Inputs target tuples must be {B,K} or

Is it possible using Solr (riak search) indexes?

Evgenii Shubin
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