Elasticsearch backup and restore results in index being in 'red' state. ES version: 6.8.23

[iZAK328 (iZAK)]

Hi,
I had tried to perform a backup of elasticsearch on a server and restore on a different server by copying the backup folder and the steps are mentioned as below.

Index name: the_hive_15
Source OS: Ubuntu 18.04 - Elasticsearch version: 6.8.4
Destination OS: Redhat 8.6 - Elasticsearch version: 6.8.23
Elasticsearch data size: 21GB

ERROR
Index is in RED state and cannot be read by the application using Elasticsearch.
All shards failed

Steps

1. Creating backup repository

    path.repo: ["/opt/hivebackup"]

2. Change the owner of the repo

sudo chown -R elasticsearch:elasticsearch /opt/backup

3. Registering the snapshot repository

    curl -XPUT 'http://localhost:9200/_snapshot/the_hive_backup' -H 'Content-Type: application/json' -d '{
        "type": "fs",
        "settings": {
            "location": "/opt/backup",
            "compress": true,
        }
    }'

• RESPONSE

    {"acknowledged":true}
  

4. Backing up the data

    curl -XPUT 'http://localhost:9200/_snapshot/the_hive_backup/snapshot_1?wait_for_completion=true&pretty' -H 'Content-Type: application/json' -d '{
    "indices": "the_hive_15"
    }'

5. Registering the snapshot repository on the destination server

    curl -XPUT 'http://localhost:9200/_snapshot/the_hive_backup?pretty' -H 'Content-Type: application/json' -d '{
        "type": "fs",
        "settings": {
            "location": "/custom_location/hivebackup",
            "compress": true,
        }
    }'

• RESPONSE

{"acknowledged":true}

7. Restoring the data on the destination server

    curl -XPOST "http://localhost:9200/_snapshot/the_hive_backup/snapshot_1/_restore?pretty" -H 'Content-Type: application/json' -d '
    {
      "indices": "the_hive_15"
    }'

• RESPONSE

    {
        "acknowledged" : true
    }

On running the command curl -XGET "localhost:9200/_cat/indices?v", I get the health status of the index as 'red'.