Change field data cache size setting defaults

[peteralfonsi]

Description

Changes field data cache size setting to default to 35% rather than no limit (-1). Previously, by default the FD cache was only limited by the (separate) field breaker setting at 40% of heap size, which would confusingly stop further requests rather than just evicting. Also makes the size setting dynamic.

As mentioned in the original issue, I'm open to changing the actual values from 35% and 40% to whatever people think is reasonable. See original issue for reasoning behind the two settings having different values.

Related Issues

Resolves #19104

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 285140f: FAILURE

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[peteralfonsi]

Flaky test: #14407

[github-actions]

❌ Gradle check result for 1d5dd75: TIMEOUT

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[github-actions]

❌ Gradle check result for 0c7ffe5: FAILURE

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[peteralfonsi]

Flaky test: #19325

[github-actions]

❌ Gradle check result for d5d2141: FAILURE

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[peteralfonsi]

Flaky test: #18938

[github-actions]

❌ Gradle check result for b4b8d95: FAILURE

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[jainankitk]

Unrelated failures:

[Test Result](https://build.ci.opensearch.org/job/gradle-check/64066/testReport/) (2 failures / +2)

    [org.opensearch.plugin.kinesis.IngestFromKinesisIT.testAllActiveIngestion](https://build.ci.opensearch.org/job/gradle-check/64066/testReport/junit/org.opensearch.plugin.kinesis/IngestFromKinesisIT/testAllActiveIngestion/)
    [org.opensearch.index.IndexServiceTests.testAsyncTranslogTrimTaskOnClosedIndex](https://build.ci.opensearch.org/job/gradle-check/64066/testReport/junit/org.opensearch.index/IndexServiceTests/testAsyncTranslogTrimTaskOnClosedIndex/)

Retrying gradle check

[github-actions]

❌ Gradle check result for b4b8d95: null

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[github-actions]

✅ Gradle check result for 7d033c2: SUCCESS