Adobe reader 11 stopped support: It's impacted for PDF content search

In the latest version of Acrobat Reader the registry on HKEY_LOCAL_MACHINE/SOFTWARE/Classes/.pdf/PersistantHandler not available where as its coming in Adobe reader 11 version.

We are using an Adobe PDF iFilter(AcroRdIF.dll) for search indexing to do the PDF content text search in appropriate folder's PDF document. So this dll available while installing the Adobe reader 11. but now its stopped supporting and in the latest version of Adobe reader installation we could not find this dll available in the installation folder after install done and appropriate registry key also not entered in the registry. 

So is there any alternate appropriate to achieve the content search indexing in the latest version version of adobe...?