DOC-1073: Update Elasticsearch credentials to medium tier template

[freakwriter]

Remove prerequisites, convert bullet point list to more detailed numbered instructions.

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Overall readability score: 43.2 (🟢 +0)

File	Readability
elasticsearch.md	44.78 (🔴 -3.39)

View detailed metrics

🟢 - Shows an _increase_ in readability 🔴 - Shows a _decrease_ in readability File | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- [elasticsearch.md](https://github.com/n8n-io/n8n-docs/blob/c61fdb1e8fd9dfccf6d4fa45b019c4f3037d5270/docs/integrations/builtin/credentials/elasticsearch.md "docs/integrations/builtin/credentials/elasticsearch.md") | 44.78 | 26.67 | 9.18 | 15.1 | 17.26 | 7.56   | 🔴 -3.39 | 🔴 -8.67 | 🔴 -0.3 | 🔴 -0.6 | 🔴 -0.75 | 🟢 +0.15 Averages:   | Readability | FRE | GF | ARI | CLI | DCRS --- | --- | --- | --- | --- | --- | --- Average | 43.2 | 34.89 | 11.66 | 14.86 | 14.35 | 8.53   | 🟢 +0 | 🔴 -0.01 | 🟢 +0 | 🟢 +0 | 🟢 +0 | 🟢 +0

View metric targets

Metric | Range | Ideal score --- | --- | --- Flesch Reading Ease | 100 (very easy read) to 0 (extremely difficult read) | 60 Gunning Fog | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Auto. Read. Index | 6 (very easy read) to 14 (extremely difficult read) | 8 or less Coleman Liau Index | 6 (very easy read) to 17 (extremely difficult read) | 8 or less Dale-Chall Readability | 4.9 (very easy read) to 9.9 (extremely difficult read) | 6.9 or less