We need to code our way from the search box to our search index. Performing a search and rendering the results in a presentable fashion, itself, is not a tricky endeavor: Send the user’s query to the search server, and translate the response data into some user interface technology. However, there are some important issues that need to be addressed, such as security, error handling, performance, and other concerns that deserve isolation and control.

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A step-by-step guide to building a middle-tier HTTP search service in Java using MongoDB Atlas Search. Covers the three-tier architecture design, service interface definition with parameters (query, filters, pagination, field projection), and the full implementation using Java servlets. The service translates HTTP GET requests into Atlas Search aggregation pipelines with compound operators, facets for metadata, and field projections. Includes index configuration, security best practices (isolating the connection string), scalability considerations, and a future roadmap for highlighting and faceting.

How to Build a Search Service in Java with MongoDB