Removed ES query tests

.github/workflows/sigma-test.yml

@@ -23,18 +23,9 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r tools/requirements.txt -r tools/requirements-devel.txt
-        wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
-        sudo apt install -y apt-transport-https
-        echo "deb https://artifacts.elastic.co/packages/7.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic.list
-        sudo apt update
-        sudo apt install -y elasticsearch
-        sudo systemctl start elasticsearch
     - name: Test Sigma Tools and Rules
       run: |
         make test
-    - name: Test Generated Elasticsearch Query Strings
-      run: |
-        make test-backend-es-qs
     - name: Test SQL(ite) Backend
       run: |
         make test-backend-sql