It only takes a day to complete the work you have posted(spring data query's), but I'm including 2 days buffer time.
Relevant Skills and Experience
Having 1.5 year(s) experience in spring framework(spring boot), Hibernate, PostgreSQL, REST Api,...
I have written spring boot applications that have been integrated with elastic search data for the use of financial and mission applications. Using spring with elastic search is not new to me and I would be able to develop the application for you within a day provided your search queries are valid.