Magento 2.4 Could not validate a connection to Elasticsearch. No alive nodes found in your cluster

I am trying to upgrade my Magento 2.3 store to 2.4. In trying to do so, when I try to run bin/magento setup:upgrade I receive the following error: Could not validate a connection to Elasticsearch. No alive nodes found in your cluster

Here is what I have so far.

I am running nginx, here is the config file:

upstream panam_backend {
   server   php74:9000;
}

server {
    listen 80;
    server_name panam.localhost;
    set $MAGE_ROOT /var/www/html/panam.localhost;

    listen 443 ssl http2;
    ssl_certificate /var/www/html/panam.localhost/key/panam.localhost.crt;
    ssl_certificate_key /var/www/html/panam.localhost/key/panam.localhost.key;

    root $MAGE_ROOT/pub;

    index index.php;
    autoindex off;
    charset UTF-8;
    error_page 404 403 = /errors/404.php;
    #add_header "X-UA-Compatible" "IE=Edge";

    # PHP entry point for setup application
    location ~* ^/setup($|/) {
        root $MAGE_ROOT;
        location ~ ^/setup/index.php {
            fastcgi_pass   panam_backend;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }

        location ~ ^/setup/(?!pub/). {
            deny all;
        }

        location ~ ^/setup/pub/ {
            add_header X-Frame-Options "SAMEORIGIN";
        }
    }

    # PHP entry point for update application
    location ~* ^/update($|/) {
        root $MAGE_ROOT;

        location ~ ^/update/index.php {
            fastcgi_split_path_info ^(/update/index.php)(/.+)$;
            fastcgi_pass   panam_backend;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            fastcgi_param  PATH_INFO        $fastcgi_path_info;
            include        fastcgi_params;
        }

        # Deny everything but index.php
        location ~ ^/update/(?!pub/). {
            deny all;
        }

        location ~ ^/update/pub/ {
            add_header X-Frame-Options "SAMEORIGIN";
        }
    }

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location /pub/ {
        location ~ ^/pub/media/(downloadable|customer|import|theme_customization/.*.xml) {
            deny all;
        }
        alias $MAGE_ROOT/pub/;
        add_header X-Frame-Options "SAMEORIGIN";
    }

    location /static/ {
        # Uncomment the following line in production mode
        # expires max;

        # Remove signature of the static files that is used to overcome the browser cache
        location ~ ^/static/version {
            rewrite ^/static/(versiond*/)?(.*)$ /static/$2 last;
        }

        location ~* .(ico|jpg|jpeg|png|gif|svg|js|css|swf|eot|ttf|otf|woff|woff2)$ {
            add_header Cache-Control "public";
            add_header X-Frame-Options "SAMEORIGIN";
            expires +1y;

            if (!-f $request_filename) {
                rewrite ^/static/(versiond*/)?(.*)$ /static.php?resource=$2 last;
            }
        }
        location ~* .(zip|gz|gzip|bz2|csv|xml)$ {
            add_header Cache-Control "no-store";
            add_header X-Frame-Options "SAMEORIGIN";
            expires    off;

            if (!-f $request_filename) {
               rewrite ^/static/(versiond*/)?(.*)$ /static.php?resource=$2 last;
            }
        }
        if (!-f $request_filename) {
            rewrite ^/static/(versiond*/)?(.*)$ /static.php?resource=$2 last;
        }
        add_header X-Frame-Options "SAMEORIGIN";
    }

    location /media/ {
        try_files $uri $uri/ /get.php?$args;

        location ~ ^/media/theme_customization/.*.xml {
            deny all;
        }

        location ~* .(ico|jpg|jpeg|png|gif|svg|js|css|swf|eot|ttf|otf|woff|woff2)$ {
            add_header Cache-Control "public";
            add_header X-Frame-Options "SAMEORIGIN";
            expires +1y;
            try_files $uri $uri/ /get.php?$args;
        }
        location ~* .(zip|gz|gzip|bz2|csv|xml)$ {
            add_header Cache-Control "no-store";
            add_header X-Frame-Options "SAMEORIGIN";
            expires    off;
            try_files $uri $uri/ /get.php?$args;
        }
        add_header X-Frame-Options "SAMEORIGIN";
    }

    location /media/customer/ {
        deny all;
    }

    location /media/downloadable/ {
        deny all;
    }

    location /media/import/ {
        deny all;
    }

    # PHP entry point for main application
    location ~ (index|get|static|report|404|503).php$ {
        try_files $uri =404;
        fastcgi_pass   panam_backend;
        fastcgi_buffers 16 16k;
        fastcgi_buffer_size 32k;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include        fastcgi_params;

    }

    location /_cluster/health {
          proxy_pass http://192.168.77.75:9250/_cluster/health;
       }

    gzip on;
    gzip_disable "msie6";

    gzip_comp_level 6;
    gzip_min_length 1100;
    gzip_buffers 16 8k;
    gzip_proxied any;
    gzip_types
        text/plain
        text/css
        text/js
        text/xml
        text/javascript
        application/javascript
        application/x-javascript
        application/json
        application/xml
        application/xml+rss
        image/svg+xml;
    gzip_vary on;

    # Banned locations (only reached if the earlier PHP entry point regexes don't match)
    location ~* (.php$|.htaccess$|.git) {
        deny all;
    }

}
#
## Optional override of deployment mode. We recommend you use the
## command 'bin/magento deploy:mode:set' to switch modes instead.
##
## set $MAGE_MODE default; # or production or developer
##
## If you set MAGE_MODE in server config, you must pass the variable into the
## PHP entry point blocks, which are indicated below. You can pass
## it in using:
##
## fastcgi_param  MAGE_MODE $MAGE_MODE;
##
## In production mode, you should uncomment the 'expires' directive in the /static/ location block

Here is the env.php file:

<?php
return [
    'cache_types' => [
        'config' => 1,
        'layout' => 1,
        'block_html' => 1,
        'collections' => 1,
        'reflection' => 1,
        'db_ddl' => 1,
        'eav' => 1,
        'customer_notification' => 1,
        'target_rule' => 1,
        'full_page' => 1,
        'config_integration' => 1,
        'config_integration_api' => 1,
        'translate' => 1,
        'config_webservice' => 1,
        'compiled_config' => 1,
        'vertex' => 1,
        'google_product' => 0
    ],
    'db' => [
        'connection' => [
            'default' => [
                'dbname' => 'panam',
                'host' => 'db',
                'username' => 'root',
                'password' => '',
                'model' => 'mysql4',
                'engine' => 'innodb',
                'initStatements' => 'SET NAMES utf8;',
                'active' => '1',
                'profiler' => '1'
            ]
        ],
        'table_prefix' => ''
    ],
    'cache' => [
        'frontend' => [
            'default' => [
                'backend' => 'Cm_Cache_Backend_Redis',
                'backend_options' => [
                    'server' => 'redis',
                    'database' => '0',
                    'port' => '6379'
                ]
            ],
            'page_cache' => [
                'backend' => 'Cm_Cache_Backend_Redis',
                'backend_options' => [
                    'server' => 'redis',
                    'port' => '6379',
                    'database' => '1',
                    'compress_data' => '0'
                ]
            ]
        ]
    ],
    'MAGE_MODE' => 'developer',
    'backend' => [
        'frontName' => 'admin'
    ],
    'crypt' => [
        'key' => 'abfd843e41c08030189ad4ebaf1191f0'
    ],
    'resource' => [
        'default_setup' => [
            'connection' => 'default'
        ]
    ],
    'x-frame-options' => 'SAMEORIGIN',
    'session' => [
        'save' => 'redis',
        'redis' => [
            'host' => 'redis',
            'port' => '6379',
            'password' => '',
            'timeout' => '2.5',
            'persistent_identifier' => '',
            'database' => '2',
            'compression_threshold' => '2048',
            'compression_library' => 'gzip',
            'log_level' => '1',
            'max_concurrency' => '6',
            'break_after_frontend' => '5',
            'break_after_adminhtml' => '30',
            'first_lifetime' => '600',
            'bot_first_lifetime' => '60',
            'bot_lifetime' => '7200',
            'disable_locking' => '0',
            'min_lifetime' => '60',
            'max_lifetime' => '2592000'
        ]
    ],
    'install' => [
        'date' => 'Fri, 06 Apr 2018 22:04:26 +0000'
    ],
    'system' => [
        'default' => [
            'dev' => [
                'debug' => [
                    'debug_logging' => '0'
                ]
            ],
            'smile_elasticsuite_core_base_settings' => [
                'es_client' => [
                    'servers' => '192.168.77.75:9250',
                    'enable_https_mode' => '0',
                    'enable_http_auth' => '0',
                    'http_auth_user' => '',
                    'http_auth_pwd' => ''
                ]
            ]
        ]
    ]
];

Here is output of curl -XGET 'http://192.168.77.75:9250' on the host computer:

{
  "name" : "ebrownserver",
  "cluster_name" : "7.6",
  "cluster_uuid" : "wWppBNI9SR29XtyhIZ-LnQ",
  "version" : {
    "number" : "7.6.2",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "ef48eb35cf30adf4db14086e8aabd07ef6fb113f",
    "build_date" : "2020-03-26T06:34:37.794943Z",
    "build_snapshot" : false,
    "lucene_version" : "8.4.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

I’ve restarted nginx and elasticsearch many times, but it didn’t help.

Also, as far as my configuration goes, nginx is setup on the host computer while elasticsearch is on a separate server on the network. I don’t know if that changes anything, but that’s how it’s setup right now.

Also, elasticsearch used to be connected to a docker container on the host computer before it started causing a bunch of problems. The docker container had a different ip address than the one that is currently being used, so maybe a caching issue where it’s trying to use the old ip address is occurring? Not sure, just throwing it out there.

Let me know if you need anymore information.