Elasticsearch k-NN Search: Vocabulary
Elasticsearch's k-NN capabilities enable semantic search alongside traditional BM25 retrieval. Understanding dense_vector mappings, ELSER sparse encoders, semantic_text fields, and hybrid scoring is essential for modern search engineers.
dense_vector field in an Elasticsearch mapping with "index": true, "similarity": "cosine". What does "index": true enable?"index": true on a dense_vector field instructs Elasticsearch to build an HNSW (Hierarchical Navigable Small World) index on the vectors. This enables efficient approximate k-NN queries. Without indexing, k-NN search falls back to exact brute-force computation, which is slow for large datasets.Frequently Asked Questions
What does the "Elasticsearch k-NN Search: Vocabulary" vocabulary exercise cover?
This exercise tests real IT vocabulary related to elasticsearch k-nn search: vocabulary through 5 multiple-choice questions, each built from realistic workplace sentences rather than abstract definitions.
Is this vocabulary exercise free to use?
Yes. Every exercise on CoderSlingo, including this one, is completely free — no account, sign-up, or payment required.
How many questions does this exercise have?
This exercise has 5 questions. Each one shows a real-world sentence or scenario with multiple-choice options and an explanation once you answer.
What happens after I answer a question?
You'll see immediate feedback showing whether your answer was correct, along with a short explanation of why — then a button to move to the next question, and a full results screen at the end.
Can I retry the exercise if I get questions wrong?
Yes. Once you reach the results screen, click "Try again" to reset your answers and go through the exercise from the start as many times as you like.
Do I need to create an account to take this exercise?
No account is needed. Your answers are scored in your browser during the session — nothing is saved to a server, so you can jump straight in.
Is my progress saved if I leave the page?
No — progress within an exercise resets if you navigate away or reload. Each exercise is short enough to complete in a few minutes in one sitting.
Are these vocabulary exercises connected to other topics?
Yes — browse the full vocabulary exercises hub to find related modules covering adjacent IT topics and roles.
How is this different from reading a glossary or blog article?
Exercises like this one are active recall drills — you have to choose the correct term or phrasing yourself, which builds retention faster than passively reading a definition.
Where can I find more vocabulary exercises?
Browse the full Vocabulary exercises hub for hundreds of modules covering Agile, DevOps, security, databases, architecture, and more — organised by IT role and skill.