You recently upgraded a SharePoint Server 2007 server farm to SharePoint Server 2013.
You discover that when search results contain Microsoft Word 2007 documents, the results do not
display the title of the documents. Instead, the results display a few words from the text of the
documents as the title.
You need to ensure that the title of the Word 2007 documents is displayed in the search results.
The solution must minimize administrative effort.
What should you do?

A.
Modify the EnableOptimisticTitleOverride registry value.

B.
Modify the DisableLoopbackCheck registry value.

C.
Delete and recreate the Search Service Application.

D.
Reset the index and perform a full crawl.

Explanation:
You must create a new managed property and map only TermTitle and Title crawled properties. Then
do another full crawl.
Incorrect:
Not A: This only works in SharePoint 2010. Is there a way to force search results to display word document titles?
https://social.technet.microsoft.com/Forums/office/en-US/e27b6b4f-d38f-49ec-9fca-7aa21099886f/isthere-a-way-to-force-search-results-to-display-word-document-titles?forum=sharepointsearch