[System test] Rebalance-In fails due to badmatch on couch_set_view_group

• Setup 7 Node cluster : 2 Buckets, 1 Ddoc, 2 views,
• Load 10M and 8 M items
• Rebalance In 1 node, with ongoing updates on cluster @ 4-5k ops/sec.

Rebalance In fails with error [attached in rebal.txt]

Rebalance exited with reason {unexpected_exit,
{'EXIT',<0.32470.4>,
{{{{badmatch,
{error,
{{function_clause,
[{couch_set_view_group,handle_info,
[

{'DOWN',#Ref<17859.0.44.80300>, process,<17859.26705.3>,normal}

,
{state,
{"/index",<<"default">>,
{set_view_group,
<<183,175,50,56,240,241,203,167,
183,109,248,162,43,216,146,168>>,
nil,<<"default">>,
<<"_design/ddoc1">>,[],
[{set_view,0,
<<"function(doc)

{emit(doc.key,doc.key_num);}">>,
undefined,
{mapreduce_view,
[<<"view1">>],
nil,[],[]}},
{set_view,1,
<<"function(doc,meta){emit(meta.id,doc.key);}">>,
undefined,
{mapreduce_view,
[<<"view2">>],
nil,[],[]}}],
nil,nil, {set_view_index_header,2,0,0,0,0, [],nil,[],false,[],nil,[],[]},
main,nil,nil,nil,[],
mapreduce_view,".view",prod,
couch_set_view_stats_prod,0,nil}},
nil,
{set_view_group,
<<183,175,50,56,240,241,203,167,183,
109,248,162,43,216,146,168>>,
<17859.26135.3>,<<"default">>,
<<"_design/ddoc1">>,[],
[{set_view,0,
<<"function(doc){emit(doc.key,doc.key_num);}

">>,
#Ref<17859.0.44.45759>,
{mapreduce_view,