Now that we have an IndexSearcher, we are ready to proceed to querying. To begin, we will need to construct a Query object to pass into IndexSearch's search method. There are a couple ways to construct a Query. Using a QueryParser class or constructing a Query programmatically, QueryParser provides the utility to interpret text and convert it into a Query. If you need to use search modifiers (for example, term must exist), there is a certain syntax to follow in order to form a query string. By default, a search phrase will return any documents that have matches on any of the query terms. We will demonstrate both QueryParser and constructing your own Query in this section.

Directory directory = 
    FSDirectory.open(new File("/data/index"));
IndexReader indexReader = DirectoryReader.open(directory...