This document is a guide that outlines ten reasons for reconsidering the use of Apache Solr in ecommerce applications. It begins by highlighting the importance of site search in the consumer journey, noting that a significant percentage of users directly engage with the search bar on retail websites. The guide discusses the limitations of Solr, particularly its reliance on exact matches and lack of user-friendly features such as guided navigation and personalization. It contrasts Solr with Coveo, which offers a more intuitive search experience with features like type-ahead suggestions, advanced filtering, and machine learning capabilities. The guide emphasizes the need for a responsive user interface and the ability to provide relevant results from day one. It also addresses the importance of understanding customer behavior and the necessity for a fully managed service that simplifies deployment and maintenance. By presenting these points, the guide aims to inform ecommerce businesses about the potential drawbacks of using Solr and the advantages of alternative solutions.