How different types of indexes are stored in elastic search?

Question

In elastic search, the data is divided into lucene indexes which in-turn contain several sub-indexes or lucene segments, and each segment could be independently queried.

If we have an index with different field types requiring different datastructures like inverted index for full-text search and BKD trees for numeric data type, how are those indexes stored? Do we have different lucene segment for each field based on the data structure used or does each lucene segment contain multiple data structures (like BKD trees and inverted index) to query different fields effectively?

Val · Accepted Answer · 2024-10-27 05:10:23Z

1

Each Lucene segment is composed of multiple files having the same name as the segment but different extensions. The whole list of files is available here

However, some systems can frequently run out of file handles, and in those cases, all files can be collapsed into a single "compound" file format with the extension cfs, which contain all other files.

answered Oct 27, 2024 at 5:10

Val

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2 Comments

Ramesh Over a year ago

Thanks. So it looks like different type of indexes are stored as different index files in a single lucene segment.

Val Over a year ago

Yes, that's exactly how it works

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