I upgraded from 5.6.4 to 6.0.0, and i follow the "rolling upgrade" procedure.
Log entry is only the row posted, and appear in every node:
[2017-12-20T09:31:10,731][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:31:30,731][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:31:50,730][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:32:10,732][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:32:30,739][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:32:50,739][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:33:10,740][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:33:30,811][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:33:50,813][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:34:10,813][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:34:30,813][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:34:50,813][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:35:10,815][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:35:30,814][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:35:50,814][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:36:11,012][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:36:31,014][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
[2017-12-20T09:36:51,213][ERROR][o.e.x.m.c.n.NodeStatsCollector] [node1] collector [node_stats] timed out when collecting data
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