Sitecore Search Enhances Delta Crawling for Improved Index Accuracy
In This Article
Sitecore has introduced important enhancements to its delta crawling capabilities, further improving search index accuracy and content synchronization. Released on June 3, 2026, these updates help organizations maintain cleaner search results while reducing the need for full-site recrawls.
What Is Delta Crawling?
Delta crawling is designed to identify and process only content changes that occur after an initial crawl. By focusing on incremental updates rather than recrawling an entire website, organizations can improve indexing efficiency, reduce processing time, and keep search experiences up to date.
With the latest improvements, Sitecore has expanded the functionality of delta crawling to make content indexing more reliable and responsive to website changes.
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Improve indexing efficiency with smarter delta crawling that detects content changes, removes outdated results, and delivers fresher search experiences.
Automatic Removal of Deleted Sitemap URLs
One of the most significant enhancements addresses a common search maintenance challenge. Previously, when URLs were removed from a sitemap, outdated documents could potentially remain in the search index.
The updated delta crawler now automatically detects URLs that have been deleted from a sitemap and removes their corresponding indexed documents. This ensures that obsolete content no longer appears in search results, helping organizations maintain a more accurate and relevant search experience for users.
By keeping the search index aligned with the current state of a website, businesses can reduce content inconsistencies and improve search result quality.
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Support for Incremental Update Sources
Another notable enhancement expands delta crawling availability. The feature can now be used with sources that have incremental updates enabled.
This improvement allows organizations leveraging incremental content synchronization to benefit from delta crawling's efficiency without requiring additional configuration or full recrawling operations. As a result, content updates can be reflected in search results more quickly while minimizing system resources.
Benefits for Search Administrators
The latest delta crawling enhancements provide several advantages:
- Improved search index accuracy.
- Automatic cleanup of outdated content.
- Faster synchronization of content changes.
- Reduced crawling overhead.
- Better alignment between sitemap data and indexed content.
- Enhanced search relevance for end users.
These improvements help organizations maintain a healthier search ecosystem while simplifying content management processes.
Conclusion
The latest Sitecore Search update strengthens delta crawling by ensuring that deleted sitemap URLs are automatically removed from the search index and by extending support to sources with incremental updates enabled. Together, these enhancements improve search reliability, reduce maintenance efforts, and help organizations deliver more accurate and up-to-date search experiences.
Reference:
Sitecore Search – Improvements to Delta Crawling
Frequently Asked Questions
What is Sitecore Search delta crawling?
Sitecore Search delta crawling is an optimized crawling method that processes URLs changed since the previous successful crawl instead of recrawling the entire website, helping improve indexing speed and efficiency.
How does Sitecore delta crawling work?
Delta crawling uses the lastmod field in a sitemap to identify URLs that have changed since the previous successful crawl and focuses indexing on those updated URLs.
What are the benefits of Sitecore Search delta crawling?
Key benefits include faster indexing, fresher search results, reduced crawling overhead, improved content synchronization, automatic cleanup of deleted content and better index accuracy.
Does Sitecore Search delta crawling remove deleted URLs?
Yes. During a delta crawl, Sitecore Search can compare the current sitemap with the previous successful delta crawl and automatically remove indexed documents associated with deleted URLs.
Why is automatic deleted URL removal important?
Automatic removal helps prevent obsolete or unavailable content from continuing to appear in search results, improving search accuracy and user experience.
Does Sitecore delta crawling require a sitemap?
Yes. Delta crawling applies to supported web crawlers using a sitemap or sitemap index trigger when the sitemap includes the lastmod field and the crawler depth is configured appropriately.
What happens if the sitemap does not include lastmod?
URLs without a lastmod value can still be crawled during periodic full crawls so that content updates are not permanently missed.
Can Sitecore Search perform a full crawl?
Yes. Administrators can trigger a full crawl when comprehensive indexing is required. Full crawls complement delta crawling by ensuring broader site coverage.
How does delta crawling improve index accuracy?
Delta crawling helps keep the search index aligned with website changes by processing updated content and removing documents associated with deleted URLs when supported by the crawl workflow.
Can Sitecore Search delta crawling reduce system resources?
Yes. By focusing on changed URLs rather than recrawling every URL, delta crawling can reduce unnecessary crawling and indexing work while improving update efficiency.
