Hey @neergttocsdivad,
What version of Enterprise Search are you running? By default, crawls against 127.0.0.1 wont work for security reasons.
If you need to override this for testing, you can do so with a configuration option. Look for Crawler HTTP Security Controls and Crawler DNS Security Controls here: Configuration | Elastic Enterprise Search Documentation [7.15] | Elastic.
I hope that helps!
Ross