How to Remove Content from Search Results in SharePoint
By default, items and documents in apps appear in the SharePoint search results. You may not want these items to appear in search results, and will want to remove the content.
To keep items and document in apps out of SharePoint search results, follow these steps:
Navigate to the app that you want to remove from search by clicking the Settings gear icon and choosing Site Contents.
You see a list of all apps.
Open the app settings page by clicking the List or Library tab of the Ribbon and then clicking List Settings or Library Settings.
The app settings page appears.
Click the Advanced Settings link in the General Settings section.
The Advanced Settings page appears.
In the Search section, select the No radio button.
Click OK to save the settings.
The content of the app will not be indexed the next time the search engine indexes content.
You can view which properties are searched by clicking the Schema link in the Search section of the SharePoint Site Settings page. The Search column shows whether the property is used in building the search index.
The Search Service Application administrator can also remove specific results from the search index or results. This is accomplished in the Search Service Application Management page. Click the Crawl Log, find the result to remove, click the ellipsis button for the item, and choose Remove the Item from the Index.
Likewise, a URL can be removed from the results by clicking the Search Result Removal page in the Queries and Results section of the Search Service Application management page in Central Administration and entering the URL that should be removed from the search result.