Issues in upgrading to 7.5.0

Elastic Stack Elasticsearch
1

I tried to upgrade from 6.5.2 -> 6.8 -> 7.5
The upgrade assistant in 6.8 said indices are good to go for upgrade.
But after upgrade to 7.5, when I start kibana, i get a Fatal error:

Error: [mapper_parsing_exception] Root mapping definition has unsupported parameters: [_all : {enabled=false}]

Indeed all the indices have this in the mapping.

{
  "log-batman-2019.01" : {
    "mappings" : {
      "_all" : {
        "enabled" : false
      },
      "properties" : {
        "@timestamp" : {
          "type" : "date"
        },
        "exceptions" : {
        ......
        ......

I am wondering what went wrong? Upgrade Assistant should have given me a warning if this was an issue.

And what is the way forward? Should I be reindexing everything? Or should I update the mapping of the existing indices to remove the _all field (If such thing is possible)?

Elasticsearch is working fine. I am thinking if this has something to do with kibana.
I did remove the .kibana_1 and some more of those indices. I just kept the .kibana_10 which is currently pointing to .kibana. Was this something I should not have done?

2

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