bug(document-search): results not showing correctly after space in search string

[fynnfluegge]

When entering three characters in the search bar and hitting space afterwards, then the autocompleted result list is not displayed correctly. It seems that the search function returns wrong results (ignoring space) and as a result the highlighted search string in the autocomplete panel is displayed wrong. The not correct displayed search results should not be contained in the result set anyways, hence fixing the bug in the search-document-handler is sufficient.

Current behaviour
When hitting space in search bar some documents that shouldn't be found at all are displayed in the suggtestion list.

Expected behaviour
When hitting space in search bar the suggestion item list should be correct and item content should match search pattern.