How to migrate Elasticsearch to a new server? - elasticsearch

Question

The old server will remove, that Elasticsearch version is v6.8, the new server installed same version. Now, I'll migrate all data to the new server. Is my operation correct?
Old server: elasticsearch.yml add path.repo, for example
path.repo:["/data/backup"]
Restart Elasticsearch services
Old server
curl -H "Content-Type: application/json"
-XPUT http://192.168.50.247:9200/_snapshot/my_backup
-d '{ "type": "fs", "settings":
{ "location": "/data/backup","compress": true }}'
Create backup
curl -XPUT http://192.168.50.247:9200/_snapshot/my_backup/news0618
Restore database(new server ip:192.168.10.49 ):
curl -XPOST http://192.168.10.49:9200/_snapshot/my_backup/news0618/_restore
Are these operations can migrate all the data?

Answer 1

If you are using fs as a snapshot repository location then it will not work as your new instance is hosted on different host it will not have access to your old hosts file system. You need to use any shared location like volume mounts, S3 or Azure blob etc.
You should use reindexing rather than snapshot and restore. Its pretty simpler. Refer this link for remote reindexing:
Steps:
Whitelist remote host in elasticsearch.yaml using the reindex.remote.whitelist property in your new Elasticsearch instance:
reindex.remote.whitelist: "192.168.50.247:9200"
Restart new Elasticsearch instance.
Reindexing:
curl -X POST "http://192.168.10.49:9200/_reindex?pretty" -H 'Content-Type: application/json' -d'
{
"source": {
"remote": {
"host": "http://192.168.50.247:9200"
},
"index": "source-index-name",
"query": {
"match_all": {}
}
},
"dest": {
"index": "dest-index-name"
}
}
'
Refer this link for reindexing many indices
Warning: The destination should be configured as wanted before calling _reindex. Reindex does not copy the settings from the source or its associated template. Mappings, shard counts, replicas, and so on must be configured ahead of time.
Hope this helps!