How to search from multiple index in elastic search using C#

What you are trying to achive?

See if below links help you

https://stackoverflow.com/questions/56478093/full-text-search-with-multiple-index-in-elastic-search-using-nest-c-sharp

https://stackoverflow.com/questions/37524988/indexing-and-full-text-searching-in-elasticsearch-without-dialitics-using-c-shar

https://medium.com/@MentorMate/elasticsearch-how-to-add-full-text-search-to-your-database-ee2f3ea4d3f3

https://www.red-gate.com/simple-talk/dotnet/net-development/how-to-build-a-search-page-with-elasticsearch-and-net/