Spring Data and ElasticSearch

Question

I just started to create a app using Spring Data and Elasticsearch starter for spring boot.

My doubt is about the concept in true ... my first needs is create a type that will be able to save a lot of words.

First lets considering:

• I have a lot of files ( txt/csv ) file with about 5000 words each.

• The words has no relation one each other

So ...

1 - If I create an entity it will be only one field (something like "name") and I'll need parse the file to get each word before send it to és.

2 - If I save the entire document I'm afraid that it could affect the performance and maintenance of database in future.

What should I do? I am thinking on right way?

Thanks in advance.