Word embeddings for Information Retrieval - Document search?
Doc2Vec is on possible approach. With this, model learns to "cluster" similar sentences together. 



Most simplistic approach is to aggregate word vectors but that ignores order of words. Details on few of the approaches : 

https://towardsdatascience.com/sentence-embedding-3053db22ea77
https://medium.com/explorations-in-language-and-learning/how-to-obtain-sentence-vectors-2a6d88bd3c8b