How to do it...

The URL format for control aliases is as follows:

http://<server>/_aliases
http://<server>/<index>/_alias/<alias_name>

For managing the index aliases, we will perform the following steps:

1. We are reading the aliases and statuses for all indices using the REST API, so the method will be GET. An example of a call is as follows:

GET /_aliases

1. This gives a response similar to this one:

{
  ".monitoring-es-7-2019.04.06" : {
    "aliases" : { }
  },
  "myindex" : {
    "aliases" : { }
  }
}

1. Aliases can be changed with add and delete commands.
2. To read an alias for a single index, we use the _alias endpoint:

GET /myindex/_alias

The result should be as follows:

{
  "myindex" : {
    "aliases" : { }
  }
}

1. To add an alias, type the following command:

PUT /myindex/_alias/myalias1

The result should be as follows:

{
  "acknowledged" : true
}

This action adds the myindex index to the myalias1 alias.

1. To delete an alias, type the following command:

DELETE /myindex/_alias/myalias1

The result should be as follows:

{
  "acknowledged" : true
}

The delete action removed myindex from the myalias1 alias.