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

[margaretjgu]

Closes #360. es index and es create now accept REST-style bodies piped via stdin without requiring a document wrapper key - when the wrapper is missing it is automatically added before schema validation runs. Commands that already send {"document": {...}} are unaffected.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	1.04s
✅ REPOSITORY	gitleaks	yes		no	no	59.16s
✅ REPOSITORY	git_diff	yes		no	no	0.66s
✅ REPOSITORY	secretlint	yes		no	no	28.05s
✅ REPOSITORY	trivy	yes		no	no	17.47s
✅ TYPESCRIPT	eslint	6		0	0	5.53s

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