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As I said in the github issue, you can't have from 2.x the same field name within 2 types with different definition.
Here index1/Alarm-GardanneDRS has a field named zone_surveillance which conflicts with another type that you have in your index.
Anyway, in 6.0 multiple types are not allowed anymore so I'd say that is the right time to reindex everything and target directly 6.0.