Update ILM customization tutorial and screenshots

[dakrone]

Description

The documentation at https://www.elastic.co/guide/en/elasticsearch/reference/current/example-using-index-lifecycle-policy.html uses older language:

• It mentions "50gb" as the index size, rather than our current recommendation, which is the size of a single primary shard.
• The screenshots are of an older Kibana dashboard, for example the old version:

versus a newer version of the API:

[elasticsearchmachine]

Pinging @elastic/es-docs (Team:Docs)

[elasticsearchmachine]

Pinging @elastic/es-data-management (Team:Data Management)

[satyyam11]

Can I help?

[dakrone]

@satyyam11 certainly, feel free to open a PR for this, https://github.com/elastic/elasticsearch/blob/main/docs/reference/ilm/example-index-lifecycle-policy.asciidoc?plain=1 is the location of the file.

[satyyam11]

I have raised a PR
but there
seems to be a issue with it can you help

[satyyam11]

At first the issue was that document wasn't signed but i did that now its showing this, should i start all over again?

[satyyam11]

Also I want to update the image and replace it with the new screenshot can you tell in which folder are they located? so that I can do that

[satyyam11]

Shalll I raise a PR for image change as well?