SharePoint 2013: Content Enrichment Web Service
As SharePoint 2010 perform the entity extraction & data cleansing we required the FAST document processing stage called pipeline extensibility stage, it is no longer available. It was replaced by content enrichment web services.
As Microsoft says about it.
Please go through with the below links for more details.
- http://msdn.microsoft.com/en-us/library/jj1639 82.aspx
- Advanced Content Enrichment in SharePoint 2013 Search
- Calling WCF using Content Enrichment in Content Processing Pipeline in SharePoint 2013 Search
- Using Content Enrichment Web Service Callout in SharePoint 2013 Preview
Customize search in SharePoint 2013