Suppose you have joined in a search engine development team to design a search algorithm based on both the Vector model and the Boolean model. You have collected the following documents (unstructured) and plan to apply an index technique to convert them into an inverted index. 

Doc 1:data science is field to use scientific method, process, algorithm, system to extract knowledge. 

Doc 2:data mining is the process to discover pattern in large data to involve method at the database system. 

Doc 3:information system is the study of network of hardware and software that people use