Right now the business logic is mixed with ui logic in the search results. The `excerpt` and `title` fields in the `SearchResult` class contain the following html logic:

• <strong> tags when highlighting the query string
• html escaping
• <excerpt> and <fragment> tags in the `excerpt` field
• fragment max size

UI logic is scattered across 2 classes `ExcerptProvider` and `Periscope` and should be moved into admin-central module, in `SearchResultsGrid`