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Topology activation failed - SharePoint 2013

 I got the following error when try to modify existing topology by adding new Search Index Component 
 by this command 

New-SPEnterpriseSearchIndexComponent
  

  
 
The reason for this because the index folder 
 (Default Path is  
 C:\Program Files\Microsoft Office Servers\15.0\Data\Office Server\Applications\Index)  
 is not empty so to fix this issue you need to reset Index from Search Administration.