fix(types): fields in experimental.search can be optional

[antfu]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

The default value has been assigned here:

content/src/module.ts

Lines 528 to 550 in 12d2670

	const defaultSearchOptions: Partial<ModuleOptions['experimental']['search']> = {
	indexed: true,
	ignoredTags: ['style', 'code'],
	filterQuery: { _draft: false, _partial: false },
	options: {
	fields: ['title', 'content', 'titles'],
	storeFields: ['title', 'content', 'titles'],
	searchOptions: {
	prefix: true,
	fuzzy: 0.2,
	boost: {
	title: 4,
	content: 2,
	titles: 1
	}
	}
	}
	}
	options.experimental.search = {
	...defaultSearchOptions,
	...options.experimental.search
	}

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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