Add Wazuh indexer API reference to documentation

[adavinchi]

📌 Request Details

Required Information

• Target version: 4.12

• Request type
  • Product update
  • Fixes or corrections
  • Improvement
  • Other:
• Affected Documentation
  • Documentation section(s):
  • Specific page URLs:

Description

Additional examples/references (screenshots, code samples, links)

🛠 Additional Details