ElasticSearch Case Studies & Practical Application 5

Question 1

A gaming platform indexes player activity and needs leaderboard queries to return the top 100 players globally with sub-100ms latency. What optimization is most impactful?

Accepted Answer

Pre-compute rankings using a Transform and store results in a separate index

Answer

Transforms pre-aggregate leaderboard data into a summary index, enabling sub-millisecond reads instead of expensive real-time aggregations.

Question 2

A company uses cross-cluster replication (CCR) to maintain a disaster recovery cluster. After a failover, users report search results are 30 seconds stale. What explains this?

Accepted Answer

CCR replicates asynchronously, introducing replication lag

Answer

CCR replicates operations asynchronously from the leader, so follower indices may lag behind the leader by seconds to minutes depending on network and load.

Question 3

An enterprise ingests employee directories and needs to search by partial phone number. The phone field stores values like '+1-800-555-1234'. Which analyzer approach is correct?

Accepted Answer

Apply a custom analyzer with n-gram tokenizer on the phone field

Answer

An n-gram analyzer tokenizes the phone number into all substrings, enabling efficient partial matches without expensive wildcard or regexp queries.

Question 4

A security operations center uses Elasticsearch SIEM. Analysts need to correlate events from multiple log sources using a shared transaction ID. Which ingest technique links these events?

Accepted Answer

Using an ingest pipeline with an enrich processor to look up transaction metadata

Answer

An enrich processor in an ingest pipeline looks up data from an enrich policy and appends correlated metadata to incoming documents at index time.

Question 5

A content platform needs to prevent adult content from appearing in searches for users who have safe-search enabled. What is the cleanest implementation?

Accepted Answer

Use index aliases with a filter on adult_content=false for safe-search users

Answer

A filtered alias transparently applies a query filter to all searches through that alias, cleanly enforcing safe-search without modifying application queries.

ElasticSearch Practice Test

ElasticSearch Practice Test

ElasticSearch Case Studies & Practical Application 5