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In the video, I discussed the importance of maintaining search at scale using Elasticsearch at Twitter. Twitter built tooling around Elasticsearch to handle surges in search traffic, realtime ingestion, and backfill. The course on system design focuses on building intuition and covers realworld system design scenarios. Twitter's tooling includes an Elasticsearch proxy for standardization and a backfill service for staggered data ingestion. By deferring rights and ensuring synchronous reads, Twitter maintains stability and scalability in its Elasticsearch clusters.

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