What is Elasticsearch?

• You know, for search (and analysis)
• Data in: documents and indices
• Information out: search and analyze
• Scalability and resilience: clusters, nodes, and shards

What’s new in 8.9

• Better indexing and search performance under concurrent indexing and search
• Add multiple queries for ranking to the search endpoint
• Make text embedding for kNN search GA
• Asset tracking -geo_line in time-series aggregations

Index modules

• Index modules
• Analysis
• Index Shard Allocation
• Index blocks
• Mapper
• Merge
• Similarity module
• Slow Log
• Store