Greetings! Elasticsearch provides several methods for updating documents. However, not all of them are suitable for every use case. For instance, data migrations or scheduled ETL processes might lead to unexpected behavior and degrade the user experience. In these scenarios, Elasticsearch aliases can be leveraged to achieve seamless zero-downtime updates. What is an Alias? An alias is a logical name that acts as a pointer to one or more physical indexes. Instead of interacting directly with the index itself, applications or users can perform operations like indexing and search using an alias. Alias Switching Now, imagine we have index_v1 and want to transition to index_v2. The process involves simply updating the alia; removing index_v1 and adding index_v2. Since the applications interact with the alias rather than the indices directly, they remain unaware of the change, allowing the update to occur seamlessly without any downtime. Steps for Zero Downtime Update Before jumping in, let’...
Manju
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