ES + ES Enterprise Search via Docker Compose ignores password

Hey all, I'm trying to get Elasticsearch configured with Enterprise Search. I'm using docker compose to do so. I'm using the following files:

# Password for the 'elastic' user (at least 6 characters)
ELASTIC_PASSWORD=supersecretelasticpw

# Password for the 'kibana_system' user (at least 6 characters)
KIBANA_PASSWORD=supersecretkibanapw

# Version of Elastic products
STACK_VERSION=8.13.2

# Set the cluster name
CLUSTER_NAME=my-cluster

# Set to 'basic' or 'trial' to automatically start the 30-day trial
#LICENSE=basic
LICENSE=trial

# Port to expose Elasticsearch HTTP API to the host
#ES_PORT=9200
ES_PORT=127.0.0.1:9200

# Port to expose Kibana to the host
KIBANA_PORT=5601
#KIBANA_PORT=80

# Increase or decrease based on the available host memory (in bytes)
MEM_LIMIT=32000000000

# Project namespace (defaults to the current folder name if not set)
#COMPOSE_PROJECT_NAME=myproject

ENTERPRISE_SEARCH_PORT=3002

ENCRYPTION_KEYS=secret

And as suggested from the Enterprise Search installation page for docker, this is my docker-compose.yml file:

version: "2.2"

services:
  setup:
    image: docker.elastic.co/elasticsearch/elasticsearch:${STACK_VERSION}
    volumes:
      - certs:/usr/share/elasticsearch/config/certs
    user: "0"
    command: >
      bash -c '
        if [ x${ELASTIC_PASSWORD} == x ]; then
          echo "Set the ELASTIC_PASSWORD environment variable in the .env file";
          exit 1;
        elif [ x${KIBANA_PASSWORD} == x ]; then
          echo "Set the KIBANA_PASSWORD environment variable in the .env file";
          exit 1;
        fi;
        if [ ! -f certs/ca.zip ]; then
          echo "Creating CA";
          bin/elasticsearch-certutil ca --silent --pem -out config/certs/ca.zip;
          unzip config/certs/ca.zip -d config/certs;
        fi;
        if [ ! -f certs/certs.zip ]; then
          echo "Creating certs";
          echo -ne \
          "instances:\n"\
          "  - name: es01\n"\
          "    dns:\n"\
          "      - es01\n"\
          "      - localhost\n"\
          "    ip:\n"\
          "      - 127.0.0.1\n"\
          > config/certs/instances.yml;
          bin/elasticsearch-certutil cert --silent --pem -out config/certs/certs.zip --in config/certs/instances.yml --ca-cert config/certs/ca/ca.crt --ca-key config/certs/ca/ca.key;
          unzip config/certs/certs.zip -d config/certs;
        fi;
        echo "Setting file permissions"
        chown -R root:root config/certs;
        find . -type d -exec chmod 750 \{\} \;;
        find . -type f -exec chmod 640 \{\} \;;
        echo "Waiting for Elasticsearch availability";
        until curl -s --cacert config/certs/ca/ca.crt https://es01:9200 | grep -q "missing authentication credentials"; do sleep 30; done;
        echo "Setting kibana_system password";
        until curl -s -X POST --cacert config/certs/ca/ca.crt -u elastic:${ELASTIC_PASSWORD} -H "Content-Type: application/json" https://es01:9200/_security/user/kibana_system/_password -d "{\"password\":\"${KIBANA_PASSWORD}\"}" | grep -q "^{}"; do sleep 10; done;
        echo "All done!";
      '
    healthcheck:
      test: ["CMD-SHELL", "[ -f config/certs/es01/es01.crt ]"]
      interval: 1s
      timeout: 5s
      retries: 120

  es01:
    depends_on:
      setup:
        condition: service_healthy
    image: docker.elastic.co/elasticsearch/elasticsearch:${STACK_VERSION}
    volumes:
      - certs:/usr/share/elasticsearch/config/certs
      - esdata01:/usr/share/elasticsearch/data
    ports:
      - ${ES_PORT}:9200
    environment:
      - node.name=es01
      - cluster.name=${CLUSTER_NAME}
      - cluster.initial_master_nodes=es01
      - ELASTIC_PASSWORD=${ELASTIC_PASSWORD}
      - bootstrap.memory_lock=true
      - xpack.security.enabled=true
      - xpack.security.http.ssl.enabled=true
      - xpack.security.http.ssl.key=certs/es01/es01.key
      - xpack.security.http.ssl.certificate=certs/es01/es01.crt
      - xpack.security.http.ssl.certificate_authorities=certs/ca/ca.crt
      - xpack.security.http.ssl.verification_mode=certificate
      - xpack.security.transport.ssl.enabled=true
      - xpack.security.transport.ssl.key=certs/es01/es01.key
      - xpack.security.transport.ssl.certificate=certs/es01/es01.crt
      - xpack.security.transport.ssl.certificate_authorities=certs/ca/ca.crt
      - xpack.security.transport.ssl.verification_mode=certificate
      - xpack.license.self_generated.type=${LICENSE}
    mem_limit: ${MEM_LIMIT}
    ulimits:
      memlock:
        soft: -1
        hard: -1
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s --cacert config/certs/ca/ca.crt https://localhost:9200 | grep -q 'missing authentication credentials'",
        ]
      interval: 10s
      timeout: 10s
      retries: 120

  kibana:
    depends_on:
      es01:
        condition: service_healthy
    image: docker.elastic.co/kibana/kibana:${STACK_VERSION}
    volumes:
      - certs:/usr/share/kibana/config/certs
      - kibanadata:/usr/share/kibana/data
    ports:
      - ${KIBANA_PORT}:5601
    environment:
      - SERVERNAME=kibana
      - ELASTICSEARCH_HOSTS=https://es01:9200
      - ELASTICSEARCH_USERNAME=kibana_system
      - ELASTICSEARCH_PASSWORD=${KIBANA_PASSWORD}
      - ELASTICSEARCH_SSL_CERTIFICATEAUTHORITIES=config/certs/ca/ca.crt
      - ENTERPRISESEARCH_HOST=http://enterprisesearch:${ENTERPRISE_SEARCH_PORT}
    mem_limit: ${MEM_LIMIT}
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:5601 | grep -q 'HTTP/1.1 302 Found'",
        ]
      interval: 10s
      timeout: 10s
      retries: 120

  enterprisesearch:
    depends_on:
      es01:
        condition: service_healthy
      kibana:
        condition: service_healthy
    image: docker.elastic.co/enterprise-search/enterprise-search:${STACK_VERSION}
    volumes:
      - certs:/usr/share/enterprise-search/config/certs
      - enterprisesearchdata:/usr/share/enterprise-search/config
    ports:
      - ${ENTERPRISE_SEARCH_PORT}:3002
    environment:
      - SERVERNAME=enterprisesearch
      - secret_management.encryption_keys=[${ENCRYPTION_KEYS}]
      - allow_es_settings_modification=true
      - elasticsearch.host=https://es01:9200
      - elasticsearch.username=elastic
      - elasticsearch.password=${ELASTIC_PASSWORD}
      - elasticsearch.ssl.enabled=true
      - elasticsearch.ssl.certificate_authority=/usr/share/enterprise-search/config/certs/ca/ca.crt
      - kibana.external_url=http://kibana:5601
    mem_limit: ${MEM_LIMIT}
    healthcheck:
      test:
        [
            "CMD-SHELL",
            "curl -s -I http://localhost:3002 | grep -q 'HTTP/1.1 302 Found'",
        ]
      interval: 10s
      timeout: 10s
      retries: 120

volumes:
  certs:
    driver: local
  enterprisesearchdata:
    driver: local
  esdata01:
    driver: local
  kibanadata:
    driver: local

I'm bringing the cluster down with docker compose up -d, and down with docker compose down -v. Earlier today I had already done an install and bring-up once using this method of just elasticsearch (no enterprise search) and it worked just fine. I actually even did manage to get elasticsearch + enterprise search working no problem the first time I tried it (using these exact .env and docker-compose.yml files), but what "just worked" before seems to have randomly... stopped working. Now, when I do this... elasticsearch seems to install/start normally but is refusing my password. As in I'll go to localhost:5601/, and try to sign in as the elastic user, but it will consistently reject the password I set in the .env file. What's even weirder is that it will accept the kibana_system password (and so will let me technically log in as kibana_system), but then of course will immediately throw the error that I'm not allowed to access ES using that account.

I don't believe that I'm deviating too far from the happy path so far, so I'm not sure where the issue is coming from. Any help is appreciated.