2nd attempt at https://github.com/elastic/elasticsearch/issues/84591

references https://github.com/elastic/elasticsearch/issues/48856#issuecomment-831144741

tldr; the permission structure for the endpoint isn't useful for most users. If users can create runtime fields they should have access to this api, they shouldn't need a specific permission set. 
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/action/SecurityActionMapperTests.java
} else {
            actionNameBuilder.append("cluster:");
            actionNameBuilder.append(randomBoolean() ? "admin" : "monitor");
            actionNameBuilder.append("/");
            actionNameBuilder.append(randomAlphaOfLengthBetween(2, 12));
        }
        String randomAction = actionNameBuilder.toString();
        assumeFalse(
            "Random action is one of the known mapped values: " + randomAction,
            randomAction.equals(ClearScrollAction.NAME)
                || randomAction.equals(AnalyzeAction.NAME)
                || randomAction.equals(AnalyzeAction.NAME + "[s]")
        );
        assertThat(SecurityActionMapper.action(randomAction, null), equalTo(randomAction));
    }
    public void testClearScroll() {
        SecurityActionMapper securityActionMapper = new SecurityActionMapper();
        ClearScrollRequest clearScrollRequest = new ClearScrollRequest();
        int scrollIds = randomIntBetween(1, 10);
        for (int i = 0; i < scrollIds; i++) {
            clearScrollRequest.addScrollId(randomAlphaOfLength(randomIntBetween(1, 30)));
        }
        assertThat(SecurityActionMapper.action(ClearScrollAction.NAME, clearScrollRequest), equalTo(ClearScrollAction.NAME));
    }
    public void testClearScrollAll() {
        SecurityActionMapper securityActionMapper = new SecurityActionMapper();
        ClearScrollRequest clearScrollRequest = new ClearScrollRequest();
        int scrollIds = randomIntBetween(0, 10);
        for (int i = 0; i < scrollIds; i++) {
            clearScrollRequest.addScrollId(randomAlphaOfLength(randomIntBetween(1, 30)));