…adcms#11581)

The following is the use case.

```typescript
plugins: [
    searchPlugin({
      collections: ['products', 'posts'],
      beforeSync: ({ originalDoc, searchDoc,collectionSlug }) => {
        return {
          ...searchDoc,
          title: collectionSlug === 'products' ? originalDoc.name : originalDoc.title,
        }
      },
    }),
]
```

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Co-authored-by: Paul Popus <paul@payloadcms.com>