If we use “indexed_search” extension in TYPO3 then there are two ways to index extensions records. First one is to create “Crawler Configuration” records. The second one is to create “Indexing Configuration” records.
The “Crawler Configuration” has a drawback that is crawl all records in frontend so whole TYPO3 is run to generate a page with single view of record. The “Indexing Configuration” way scans only selected fields from record and based on that creates records on indexed_search tables.