Drop support for Elasticsearch 5 and 6

.github/workflows/test.yml

@@ -28,9 +28,7 @@ concurrency:
 # - django 4.2, python 3.12, postgres:15, parallel, DISABLE_TIMEZONE=yes
 # - django stable/5.0.x, python 3.10, postgres (allow failures)
 # - django main, python 3.10, postgres:latest, parallel (allow failures)
-# - elasticsearch 5, django 3.2, python 3.8, sqlite
-# - elasticsearch 6, django 3.2, python 3.8, postgres:latest
-# - elasticsearch 7, django 4.1, python 3.8, postgres:latest
+# - elasticsearch 7, django 3.2, python 3.8, postgres:latest
 # - opensearch 2, django 4.1, python 3.9, sqlite
 # - elasticsearch 8, django 4.2, python 3.10, sqlite, USE_EMAIL_USER_MODEL=yes
 
@@ -198,54 +196,6 @@ jobs:
           name: coverage-data
           path: .coverage.*
 
-  # https://github.com/elastic/elastic-github-actions doesn't work for Elasticsearch 5,
-  # but https://github.com/getong/elasticsearch-action does
-  test-sqlite-elasticsearch5:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        include:
-          - python: '3.8'
-            django: 'Django>=3.2,<3.3'
-    steps:
-      - name: Configure sysctl limits
-        run: |
-          sudo swapoff -a
-          sudo sysctl -w vm.swappiness=1
-          sudo sysctl -w fs.file-max=262144
-          sudo sysctl -w vm.max_map_count=262144
-      - uses: getong/elasticsearch-action@v1.2
-        with:
-          elasticsearch version: 5.6.9
-          host port: 9200
-          container port: 9200
-          host node port: 9300
-          node port: 9300
-          discovery type: 'single-node'
-      - uses: actions/checkout@v3
-      - name: Set up Python ${{ matrix.python }}
-        uses: actions/setup-python@v4
-        with:
-          python-version: ${{ matrix.python }}
-          cache: 'pip'
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -e '.[testing]' --config-settings editable_mode=strict
-          pip install "${{ matrix.django }}"
-          pip install "elasticsearch>=5,<6"
-          pip install certifi
-      - name: Test
-        run: |
-          coverage run --parallel-mode --source wagtail runtests.py wagtail.search wagtail.documents wagtail.images --elasticsearch5
-        env:
-          DATABASE_ENGINE: django.db.backends.sqlite3
-      - name: Upload coverage data
-        uses: actions/upload-artifact@v3
-        with:
-          name: coverage-data
-          path: .coverage.*
-
   test-sqlite-elasticsearch8:
     runs-on: ubuntu-latest
     strategy:
@@ -294,64 +244,6 @@ jobs:
           name: coverage-data
           path: .coverage.*
 
-  # https://github.com/getong/elasticsearch-action doesn't work for Elasticsearch 6,
-  # but https://github.com/elastic/elastic-github-actions does
-  test-postgres-elasticsearch6:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        include:
-          - python: '3.8'
-            django: 'Django>=3.2,<3.3'
-
-    services:
-      postgres:
-        image: postgres:latest
-        env:
-          POSTGRES_PASSWORD: postgres
-        ports:
-          - 5432:5432
-        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
-
-    steps:
-      - name: Configure sysctl limits
-        run: |
-          sudo swapoff -a
-          sudo sysctl -w vm.swappiness=1
-          sudo sysctl -w fs.file-max=262144
-          sudo sysctl -w vm.max_map_count=262144
-      - uses: elastic/elastic-github-actions/elasticsearch@master
-        with:
-          stack-version: 6.8.13
-      - uses: actions/checkout@v3
-      - name: Set up Python ${{ matrix.python }}
-        uses: actions/setup-python@v4
-        with:
-          python-version: ${{ matrix.python }}
-          cache: 'pip'
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install "psycopg2>=2.6"
-          pip install -e '.[testing]' --config-settings editable_mode=strict
-          pip install "${{ matrix.django }}"
-          pip install "elasticsearch>=6,<7"
-          pip install certifi
-      - name: Test
-        run: |
-          coverage run --parallel-mode --source wagtail runtests.py wagtail.search wagtail.documents wagtail.images --elasticsearch6
-        env:
-          DATABASE_ENGINE: django.db.backends.postgresql
-          DATABASE_HOST: localhost
-          DATABASE_USER: postgres
-          DATABASE_PASSWORD: postgres
-          USE_EMAIL_USER_MODEL: ${{ matrix.emailuser }}
-      - name: Upload coverage data
-        uses: actions/upload-artifact@v3
-        with:
-          name: coverage-data
-          path: .coverage.*
-
   test-postgres-elasticsearch7:
     runs-on: ubuntu-latest
     continue-on-error: ${{ matrix.experimental }}
@@ -359,7 +251,7 @@ jobs:
       matrix:
         include:
           - python: '3.8'
-            django: 'Django>=4.1,<4.2'
+            django: 'Django>=3.2,<3.3'
             experimental: false
 
     services:
@@ -460,9 +352,7 @@ jobs:
       - test-sqlite
       - test-postgres
       - test-mysql
-      - test-sqlite-elasticsearch5
       - test-sqlite-elasticsearch8
-      - test-postgres-elasticsearch6
       - test-postgres-elasticsearch7
       - test-sqlite-opensearch2
     runs-on: ubuntu-latest

docs/contributing/developing.md

@@ -159,7 +159,7 @@ It is also possible to set `DATABASE_DRIVER`, which corresponds to the `driver`
 
 ### Testing Elasticsearch
 
-You can test Wagtail against Elasticsearch by passing the argument `--elasticsearch5`, `--elasticsearch6`, `--elasticsearch7` or `--elasticsearch8` (corresponding to the version of Elasticsearch you want to test against):
+You can test Wagtail against Elasticsearch by passing the argument `--elasticsearch7` or `--elasticsearch8` (corresponding to the version of Elasticsearch you want to test against):
 
 ```sh
 python runtests.py --elasticsearch8

docs/releases/6.0.md

@@ -37,6 +37,10 @@ depth: 1
 
 ## Upgrade considerations - changes affecting all projects
 
+### Support for Elasticsearch 5 and 6 dropped
+
+The Elasticsearch 5 and 6 backends have been removed. If you are using one of these backends, you will need to upgrade to Elasticsearch 7 or 8 before upgrading to Wagtail 6.0.
+
 ## Upgrade considerations - deprecation of old functionality
 
 ## Upgrade considerations - changes affecting Wagtail customisations

docs/topics/search/backends.md

@@ -37,10 +37,6 @@ If you have disabled auto-update, you must run the [](update_index) command on a
 
 ## `ATOMIC_REBUILD`
 
-```{warning}
-This option may not work on Elasticsearch version 5.4.x, due to [a bug in the handling of aliases](https://github.com/elastic/elasticsearch/issues/24644) - please upgrade to 5.5 or later.
-```
-
 By default (when using the Elasticsearch backend), when the `update_index` command is run, Wagtail deletes the index and rebuilds it from scratch. This causes the search engine to not return results until the rebuild is complete and is also risky as you can't roll back if an error occurs.
 
 Setting the `ATOMIC_REBUILD` setting to `True` makes Wagtail rebuild into a separate index while keeping the old index active until the new one is fully built. When the rebuild is finished, the indexes are swapped atomically and the old index is deleted.
@@ -62,23 +58,13 @@ This backend is intended to be used for development and also should be good enou
 
 ### Elasticsearch Backend
 
-Elasticsearch versions 5, 6, 7 and 8 are supported. Use the appropriate backend for your version:
+Elasticsearch versions 7 and 8 are supported. Use the appropriate backend for your version:
 
--   `wagtail.search.backends.elasticsearch5` (Elasticsearch 5.x)
--   `wagtail.search.backends.elasticsearch6` (Elasticsearch 6.x)
 -   `wagtail.search.backends.elasticsearch7` (Elasticsearch 7.x)
 -   `wagtail.search.backends.elasticsearch8` (Elasticsearch 8.x)
 
 Prerequisites are the [Elasticsearch](https://www.elastic.co/downloads/elasticsearch) service itself and, via pip, the [elasticsearch-py](https://elasticsearch-py.readthedocs.io/) package. The major version of the package must match the installed version of Elasticsearch:
 
-```sh
-pip install "elasticsearch>=5.0.0,<6.0.0"  # for Elasticsearch 5.x
-```
-
-```sh
-pip install "elasticsearch>=6.4.0,<7.0.0"  # for Elasticsearch 6.x
-```
-
 ```sh
 pip install "elasticsearch>=7.0.0,<8.0.0"  # for Elasticsearch 7.x
 ```
@@ -87,10 +73,6 @@ pip install "elasticsearch>=7.0.0,<8.0.0"  # for Elasticsearch 7.x
 pip install "elasticsearch>=8.0.0,<9.0.0"  # for Elasticsearch 8.x
 ```
 
-```{warning}
-Version 6.3.1 of the Elasticsearch client library is incompatible with Wagtail. Use 6.4.0 or above.
-```
-
 The backend is configured in settings:
 
 ```python

runtests.py

@@ -19,8 +19,6 @@ def make_parser():
         default="imminent",
     )
     parser.add_argument("--postgres", action="store_true")
-    parser.add_argument("--elasticsearch5", action="store_true")
-    parser.add_argument("--elasticsearch6", action="store_true")
     parser.add_argument("--elasticsearch7", action="store_true")
     parser.add_argument("--elasticsearch8", action="store_true")
     parser.add_argument("--emailuser", action="store_true")
@@ -61,12 +59,6 @@ def runtests():
     if args.postgres:
         os.environ["DATABASE_ENGINE"] = "django.db.backends.postgresql"
 
-    if args.elasticsearch5:
-        os.environ.setdefault("ELASTICSEARCH_URL", "http://localhost:9200")
-        os.environ.setdefault("ELASTICSEARCH_VERSION", "5")
-    elif args.elasticsearch6:
-        os.environ.setdefault("ELASTICSEARCH_URL", "http://localhost:9200")
-        os.environ.setdefault("ELASTICSEARCH_VERSION", "6")
     elif args.elasticsearch7:
         os.environ.setdefault("ELASTICSEARCH_URL", "http://localhost:9200")
         os.environ.setdefault("ELASTICSEARCH_VERSION", "7")

tox.ini

@@ -2,13 +2,11 @@
 skipsdist = True
 usedevelop = True
 
-envlist = py{38,39,310,311,312}-dj{32,41,42,50stable,main}-{sqlite,postgres,mysql,mssql}-{elasticsearch8,elasticsearch7,elasticsearch6,elasticsearch5,noelasticsearch}-{customuser,emailuser}-{tz,notz},
+envlist = py{38,39,310,311,312}-dj{32,41,42,50stable,main}-{sqlite,postgres,mysql,mssql}-{elasticsearch8,elasticsearch7,noelasticsearch}-{customuser,emailuser}-{tz,notz},
 
 [testenv]
 install_command = pip install -e ".[testing]" -U {opts} {packages}
 commands =
-    elasticsearch5: coverage run runtests.py wagtail.search wagtail.documents wagtail.images --elasticsearch5
-    elasticsearch6: coverage run runtests.py wagtail.search wagtail.documents wagtail.images --elasticsearch6
     elasticsearch7: coverage run runtests.py wagtail.search wagtail.documents wagtail.images --elasticsearch7
     elasticsearch8: coverage run runtests.py wagtail.search wagtail.documents wagtail.images --elasticsearch8
     noelasticsearch: coverage run runtests.py {posargs}
@@ -32,10 +30,6 @@ deps =
 
     postgres: psycopg2>=2.6
     mysql: mysqlclient>=1.4,<2
-    elasticsearch5: elasticsearch>=5,<6
-    elasticsearch5: certifi
-    elasticsearch6: elasticsearch>=6.4.0,<7
-    elasticsearch6: certifi
     elasticsearch7: elasticsearch>=7,<8
     elasticsearch7: certifi
     elasticsearch8: elasticsearch>=8,<9

wagtail/test/settings.py

@@ -224,10 +224,6 @@ if "ELASTICSEARCH_URL" in os.environ:
         backend = "wagtail.search.backends.elasticsearch8"
     elif os.environ.get("ELASTICSEARCH_VERSION") == "7":
         backend = "wagtail.search.backends.elasticsearch7"
-    elif os.environ.get("ELASTICSEARCH_VERSION") == "6":
-        backend = "wagtail.search.backends.elasticsearch6"
-    elif os.environ.get("ELASTICSEARCH_VERSION") == "5":
-        backend = "wagtail.search.backends.elasticsearch5"
 
     WAGTAILSEARCH_BACKENDS["elasticsearch"] = {
         "BACKEND": backend,