Reindex API: An unexpected authentication error occurred

Hello everyone,
I'm trying to migrate an index from Cluster A to Cluster B using the Reindex from remote

Add each ip segment in my whitelist in both cluster:

reindex.remote.whitelist: ["123.176.49.*:9200","123.188.49.*:9200","123.176.61.*:9200","*.ardp.local"]
reindex.ssl.verification_mode: none

This is how my connection looks in Dev Tool:

POST _reindex
  "source": {
    "remote": {
      "host": ""
    "index": "pages",
    "query": {
      "match": {
        "test": "data"
  "dest": {
    "index": "my-pages"

When executing the reindex action I get the following error

An unexpected authentication error occurred. Please log in again.

Several days ago I have been looking for information on how to perform an index migration from one cluster to another but I was unsuccessful.
Any suggestions on how I should migrate?



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