A lot of confusion and I can't seem to solve this issue

[DeaD_EyE]

Thanks for sharing this but what you have shared is completely the opposite of what i wanted done. For instance if I check this IP
118.31.106.59 is down!

It says that it's down but the fact that this is not down when you check using a specific port which in this case is 9200.

The host itself could ignore ICMP packets (standard on Windows).
Something between could filter out ICMP packets. Using ping is not a reliable method to detect if a host is reachable over network.

Then you shared this code:

import requests
 
with open('ip_lst1.txt') as f:
    for ip in f:
        ip = ip.strip()
        print(ip)
        response = requests.get(f"http://{ip}:9200/_cat/indices")
        print(response.text.strip())

You got this Exception: requests.exceptions.ConnectionError

Then catch this exception:

import requests
 
with open('ip_lst1.txt') as f:
    for ip in f:
        ip = ip.strip()
        print(ip)
        try:
            response = requests.get(f"http://{ip}:9200/_cat/indices")
        except requests.exceptions.ConnectionError:
            print("Connection error")
        else:
            print(response.text.strip())

In addition, you could and should add a timeout. It happens very frequently, that a host answers veryyy slooooooow.

import requests
 
with open('ip_lst1.txt') as f:
    for ip in f:
        ip = ip.strip()
        print(ip)
        try:
            # with timeout of 5 seconds
            # if timeout happens -> requests.exceptions.ConnectionError is raised
            response = requests.get(f"http://{ip}:9200/_cat/indices", timeout=5)
        except requests.exceptions.ConnectionError:
            print("Connection error")
        else:
            print(response.text.strip())

By the way, f should be fd or another better recognizable name.