fix(es): accept REST-style bodies for index and create

[margaretjgu]

Summary

Closes #360. es index and es create now accept REST-style bodies piped via stdin (e.g. echo '{"name":"test"}' | elastic es index --index test --id 1). When the stdin JSON is missing the document wrapper key, it is automatically wrapped before schema validation runs. Commands that already provide the {"document": {...}} wrapper are unaffected.

Test plan

• echo '{"name":"test"}' | elastic es index --index test --id 1 no longer errors with input validation failed
• echo '{"document":{"name":"test"}}' | elastic es index --index test --id 1 still works
• Unit tests: inputTransform in factory.test.ts, REST-style body in register.test.ts
• Full test suite passes (npx tsx --test test/**/*.test.ts)

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	0.97s
✅ REPOSITORY	gitleaks	yes		no	no	60.18s
✅ REPOSITORY	git_diff	yes		no	no	0.05s
✅ REPOSITORY	secretlint	yes		no	no	30.14s
✅ REPOSITORY	trivy	yes		no	no	17.69s
✅ TYPESCRIPT	eslint	6		0	0	6.44s

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