With the advent to deep learning models, there is a lot of new work to be done in the area of information retrieval (IR). See below for examples.

• Azad & Deepak 2017 - Query Expansion Techniques for Information Retrieval: A Survey

• Yu et al 2021 - PGT: Pseudo Relevance Feedback Using a Graph-Based Transformer
• Naseri et al 2021 - CEQE: Contextualized Embeddings for Query Expansion
• Gao et al 2021 - COIL: Revisit Exact Lexical Match in Information Retrieval with Contextualized Inverted List There is really a lot that can be done in this area. This is just the beginning

• Lemur Open-source research search engine
• PeARS Local browser-based search engine (seems to be a research system)

• SIGIR, 2019, 2020, 2021

• James Allan
• Jamie Callan (not up-to-date) or arXiv
• Bruce Croft
• Laura Dietz

• Learning to Rank