Implement Elasticsearch 7

[Lisa Seeto]

Related to https://bugs.launchpad.net/mahara/+bug/1865115

Currently Elasticsearch-PHP is at version 6.1.0. We will update this to version 7.X, i.e. the latest in the 7. series

https://github.com/elastic/elasticsearch-php/releases

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/11920

[Mahara Bot (dev-mahara)]

Patch for "main" branch: https://reviews.mahara.org/12105

[Mahara Bot (dev-mahara)]

Patch for "main" branch: https://reviews.mahara.org/12498

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/c/mahara/+/12105
Committed: https://git.mahara.org/mahara/mahara/commit/b096dffaa133f25c243d0afda523e18ac9aafde9
Submitter: "Robert Lyon <email address hidden>"
Branch: main

commit b096dffaa133f25c243d0afda523e18ac9aafde9
Author: Gold <email address hidden>
Date: Mon Aug 16 13:16:49 2021 +1200

Bug 1890356 : New Elasticsearch7 search plugin

Ready for the world to test.

To test:

Start with the README.md in `dev/elasticsearch7`. That will help you
stand up containers for testing.

Next, Admin > Extensions > Plugins and enable Elasticsearch 7.

Configure the Plugin. Select all Artefact types to make testing easy.

Requeueing individual content types is a WIP. Users and Groups are
available.

Next, Admin > Configure Site > Site Options : Search settings. Select
Elasticsearch 7.

Setup complete. At this point you can start creating test content.
A summary of this should appear on the plugin page under the Index reset
section. Running cron should index the items.

Current state:

Reports/Event logs.

✔️ Index creation
✔️ Content indexing
✔️ Catch All mapping
✔️ Search page with faceted tabs
✔️ ACL restrictions
✔️ Tags
✔️ Reports
✔️ Event logs

There is now support for the Monitor module. The ModuleType is
'search'. It is modular to allow it to work with the selected search
plugin. The ES7 search plugin has been configured to work with it.

Additional changes for errors:

ERROR: [1] bootstrap checks failed. You must address the points described in the following [1] lines before starting Elasticsearch.
es03 | bootstrap check failure [1] of [1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]

Changes
```
ulimits:
nofile:
soft: 65536
```
hard: 65536

Change-Id: Id5ff1b0553a37011bcc3926a53eb01cad89645c4

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/c/mahara/+/12498
Committed: https://git.mahara.org/mahara/mahara/commit/517502f1b3716848f5c3af14c05dab15e856b26d
Submitter: "Robert Lyon <email address hidden>"
Branch: main

commit 517502f1b3716848f5c3af14c05dab15e856b26d
Author: Dianne Tennent <email address hidden>
Date: Mon Mar 14 14:14:37 2022 +1300

Bug 1890356: Behat tests for Elasticsearch7

Testing ES7 with behat:

All ES7 tests have the @manual tag so they will not run unless you
specify that tag.

This patchset updates mahara_behat.sh so a feature (file or dir) can be
specified as well as a tag.

i.e. ./mahara_behat.sh rundebug elasticsearch7/ @manual

Includes new Behat tests:
- "I should see "text" at matrixpoint "y,x"
- Ability to create group page comments in background step for
"pagecomments"
- A new step for selecting options from multiple sharing suboptions:
"And I select "name" from select2 hidden search box in row number "x"

Change-Id: Ib3a17be355a65d54fba07d5402e67530a4d462c9