This class acts as a core component which creates/updates indexes during the indexing process.

This class represents the storage location of the indexes.

This class is responsible to analyze a document and get the tokens/words from the text which is to be indexed. Without analysis done, IndexWriter cannot create index.

This class represents a virtual document with Fields where the Field is an object which can contain the physical document’s contents, its meta data and so on. The Analyzer can understand a Document only.

This is the lowest unit or the starting point of the indexing process. It represents the key value pair relationship where a key is used to identify the value to be indexed. Let us assume a field used to represent contents of a document will have key as “contents” and the value may contain the part or all of the text or numeric content of the document. Lucene can index only text or numeric content only.