[ES docker] Fixing script compilation settings to resolve CI errors

[P1llus]

This PR resolves errors like this:

�[36melasticsearch_1              |�[0m java.lang.IllegalArgumentException: Context cache settings [script.context.ingest.cache_max_size, script.context.processor_conditional.cache_max_size, script.context.template.cache_max_size, script.context.template.max_compilations_rate] requires [script.max_compilations_rate] to be [use-context]
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.script.ScriptService.validateCacheSettings(ScriptService.java:289)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.script.ScriptService.<init>(ScriptService.java:214)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.node.Node.newScriptService(Node.java:1296)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.node.Node.<init>(Node.java:444)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.node.Node.<init>(Node.java:291)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:221)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:221)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:401)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:167)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:158)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:75)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:114)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.cli.Command.main(Command.java:79)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:123)
�[36melasticsearch_1              |�[0m 	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:81)
�[36melasticsearch_1              |�[0m For complete error details, refer to the log at /usr/share/elasticsearch/logs/docker-cluster.log

However this is a short term resolution. From 7.16+ it is deprecated to set context specific settings for compilation rates etc, all of these should be removed:

    - "script.max_compilations_rate=use-context"
    - "script.context.template.max_compilations_rate=unlimited"
    - "script.context.ingest.cache_max_size=2000"
    - "script.context.processor_conditional.cache_max_size=2000"
    - "script.context.template.cache_max_size=2000"

To make this PR work with both older and newer versions however, I have simply added the setting that was missing, so that build can pass on both new and old.

Deprecation notice: https://www.elastic.co/guide/en/elasticsearch/reference/7.16/migrating-7.16.html#breaking_716_cluster_deprecations

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[mtojek]

LGTM if it helps with problems with starting the 7.16.0 stack.

[P1llus]

Just waiting for a confirmation that it will still work in 8.0. Or if the defaults in 7.14 is already good enough so these could be removed, because setting these limits is usually a way to resolve painless script compilation rates in older versions.

[elasticmachine]

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• Start Time: 2021-10-25T09:05:24.623+0000

• Duration: 35 min 41 sec

• Commit: 0d44049

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Test	Results
Failed	0
Passed	438
Skipped	4
Total	442

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[P1llus]

I will merge this for now, to fix CI for any package with 7.16 version constraints. We will discuss 8.0 separately.