Lucene's StoredField Data Type

Overview

The StoredField data type in Lucene is utilized for storing the original values of a field so that it can be later retrieved. This field type does not contribute to the document's searchable index, making it unsuitable for search queries.

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Key Features

1. Purpose

• What: Used for storing actual values.
• Why: Useful for retrieving the original value when reading a document from the index, for displaying or for further post-processing.

2. Storage

• What: Value is stored as-is.
• Why: Allows for the exact, original value to be retrieved without any transformation or loss of information.

3. Usage

• What: Suited for fields whose original values need to be retrieved.
• Example: Storing and retrieving the lastModified timestamp for a document.

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Code Example

Here's a code snippet to demonstrate how StoredField is added to a Lucene Document.

import org.apache.lucene.document.Document;
import org.apache.lucene.document.StoredField;

Document doc = new Document();
long lastModifiedTime = 1612137600L; // Example timestamp
doc.add(new StoredField("lastModifiedStored", lastModifiedTime));

Notes

If you want to use range queries on timestamp look at Lucene's LongPoint Data Type

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Backlinks

• Lucene's LongPoint Data Type