Migrate data 6.4 > 6.8 > 7.2

Hello,
my environment: Windows 2012
I have migrated data from 6.4 to 6.8:

  1. backup data on 6.4
  2. restore backup on 6.8
    everything works fine.

Next I have migrated data from 6.8 to 7.2.

  1. backup data on 6.8
  2. restore backup on 7.2
    All indices are visible, I have installed elasticsearch-HQ-master but when I open kibana page I have this error:
{"message":"mapping set to strict, dynamic introduction of [references] within [doc] is not allowed: [strict_dynamic_mapping_exception] mapping set to strict, dynamic introduction of [references] within [doc] is not allowed","statusCode":400,"error":"Bad Request"}

I don't undestand this error and how can I fix it?

This might help you