Create index at startup

Elastic Stack Elasticsearch
1

Hi,

I wish to create an Elasticsearch plugin, this plugin requires some information to be stored. Is there any way to create an index & its mappings at startup time?

I found this: Index Creation on Startup?
But it does not answer the question.

Thanks in advance!

2

you could use a cluster state listener and wait until the cluster is ready and then check for the existence of that index.

Note that a one time check is not enough, as you may accidentally delete that index - thus the cluster state listener makes sense.

3

Thank you Spinscale,

By state listener I assume you mean either the afterStart() or clusterChanged()?

The issue with this is that the requests are blocking requests. Do you recommend running these on a generic thread or as async requests?

With async requests it would require two one to check its existence and once to actually create the index.

Thanks!

4

the clusterChanged event may not be blocked, as it is called by an update thread for all registered listeners sequentially - thus you need to make sure in your own code that you a) run async, b) do not trigger a new async check for each cluster state update.

5

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