---
- name: Uninstall and Revert Elasticsearch Configuration
  hosts: elasticsearch_hosts
  become: true
  vars:
    # Set this to 'false' if you want to keep Java (OpenJDK) installed on the system
    # because other applications might be using it.
    remove_java: true

  tasks:
    - name: "BLOCK: Stop and Remove Elasticsearch Service"
      block:
        - name: Stop and disable Elasticsearch service
          ansible.builtin.systemd:
            name: elasticsearch
            state: stopped
            enabled: false
          ignore_errors: true # Ignore errors if the service doesn't exist

        - name: Purge Elasticsearch package and its config files
          ansible.builtin.apt:
            name: elasticsearch
            state: absent
            autoremove: true
            purge: true
          ignore_errors: true # Ignore errors if the package isn't installed

    - name: "BLOCK: Clean Up Elasticsearch Files and Directories"
      block:
        # --- MODIFIED SECTION START ---
        - name: Find all contents within the /var/lib/elasticsearch mountpoint
          ansible.builtin.find:
            paths: /var/lib/elasticsearch
            hidden: true
          register: contents_to_delete

        - name: Delete all contents found within the mountpoint (leaving the mountpoint itself)
          ansible.builtin.file:
            path: "{{ item.path }}"
            state: absent
          loop: "{{ contents_to_delete.files | sort(attribute='path', reverse=true) }}"
          loop_control:
            label: "{{ item.path }}"
        # --- MODIFIED SECTION END ---

        - name: Remove Elasticsearch log directory
          ansible.builtin.file:
            path: /var/log/elasticsearch
            state: absent

        - name: Remove Elasticsearch config directory (just in case purge missed it)
          ansible.builtin.file:
            path: /etc/elasticsearch
            state: absent

    - name: "BLOCK: Remove APT Repository and GPG Key"
      block:
        - name: Remove Elasticsearch APT repository
          ansible.builtin.apt_repository:
            repo: "deb https://artifacts.elastic.co/packages/9.x/apt stable main"
            state: absent
            filename: elastic-9.x

        - name: Remove Elasticsearch GPG key
          ansible.builtin.file:
            path: /etc/apt/trusted.gpg.d/elasticsearch.gpg
            state: absent

    - name: "BLOCK: Revert System Tuning"
      block:
        - name: Revert vm.max_map_count setting
          ansible.posix.sysctl:
            name: vm.max_map_count
            state: absent
            reload: true

        - name: Remove Elasticsearch user memory limit
          community.general.pam_limits:
            domain: "elasticsearch"
            limit_type: "-"
            limit_item: "memlock"
            state: absent

        - name: Remove Elasticsearch user file descriptor limit
          community.general.pam_limits:
            domain: "elasticsearch"
            limit_type: "-"
            limit_item: "nofile"
            state: absent

    - name: "BLOCK: (Optional) Uninstall Java"
      block:
        - name: Uninstall OpenJDK package
          ansible.builtin.apt:
            name: openjdk-21-jdk
            state: absent
            autoremove: true
      when: remove_java

    - name: Final APT cache update
      ansible.builtin.apt:
        update_cache: true