Adding alias to index in elastic search template runtime

Question

I want to add an alias to the index in elasticsearch template, but the alias is not always fixed. Its prepended by a client id. Due to the size of the data, we are creating monthly indexes for each client separately, and I want a single to query the data from all monthly indexes. However, because each client has different indexes, the alias has to prepended by clientId. How can I achieve this?

Eg: my indexes are:

client1_01_18_user_location/user_location, client1_02_18_user_location/user_location

and

client2_01_18_user_location/user_location, client2_02_18_user_location/user_location

The data for the month of January goes to 1st index, and for Feb goes to 2nd index in each client's case. I want an alias client1_ul or client2_ul to be created, based on, for which client the data is being inserted.

How do I achieve this?

I did not fully understand your question. You can easily create an alias for existing index with PUT /client1_01_18_user_location/_alias/client1_ul. Is there some problem with this approach? — briarheart
– briarheart, Commented Mar 28, 2018 at 18:29
No. But because, these are monthly indexes, and I do not want someone to keep an eye on creating monthly indexes before the data is written to the index, I want to register a template which creates the index with a prefined mapping and alias, anytime, the index is not found, while writing the data. — Ashish Pandey
– Ashish Pandey, Commented Mar 28, 2018 at 20:12

Dario Balinzo · Accepted Answer · 2018-03-28 20:22:49Z

4

You can solve with a POST like this:

POST /_aliases
{
    "actions" : [
        { "add" : { "index" : "client1*", "alias" : "client1_ul" } }
    ]
}

This call will add all the index of the form client1* to the alias client1_ul, that can be used to query all the months.

You will need a POST for each user.

Otherwise, you can use a index template for each client, if not all the indexes are present when you add the alias. The template can provide an alias:

PUT _template/template_1
{
    "index_patterns" : ["client1*"],
    "mappings" : {
        ... optional
    },
    "aliases" : {
        "client1_ul" : {}
    }
}

In this way the alias will be added to each index at the index creation, automatically by elasticsearch.

edited Mar 28, 2018 at 20:22

answered Mar 28, 2018 at 20:05

Dario Balinzo

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1 Comment

Ashish Pandey Over a year ago

But there are other indexes in the system too, that start with client1_, and are not monthly indexes, so I can't do it like this.

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