## Description

During Elasticsearch boot, users get the following message:

> license mode is [trial], currently licensed security realms are [reserved/reserved,file/default_file,native/default_native]

Even if it's technically true (and necessary), it may be confusing for end users since they may expect `[basic]` instead.

## Proposal

Avoid the message reporting the trial license, since the "correct" license level is written again later in the boot process.
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/RealmsTests.java
builder.put("xpack.security.authc.realms.kerberos.realm_1.order", 1);
        builder.put("xpack.security.authc.realms.kerberos.realm_2.order", 2);
        final Settings settings = builder.build();
        Environment env = TestEnvironment.newEnvironment(settings);
        final IllegalArgumentException iae = expectThrows(
            IllegalArgumentException.class,
            () -> new Realms(settings, env, factories, licenseState, threadContext, reservedRealm)
        );
        assertThat(
            iae.getMessage(),
            is(
                equalTo(
                    "multiple realms [realm_1, realm_2] configured of type [kerberos], [kerberos] can only have one such realm configured"
                )
            )
        );
    }
    public void testWarningsForReservedPrefixedRealmNames() throws Exception {
        Settings.Builder builder = Settings.builder().put("path.home", createTempDir());
        final boolean invalidFileRealmName = randomBoolean();
        final boolean invalidNativeRealmName = randomBoolean();
        
        final int upperBound = (invalidFileRealmName || invalidNativeRealmName) ? randomRealmTypesCount : randomRealmTypesCount - 1;
        final int invalidOtherRealmNameIndex = randomIntBetween(0, upperBound);
        final List<String> invalidRealmNames = new ArrayList<>();
        if (invalidFileRealmName) {
            builder.put("xpack.security.authc.realms.file._default_file.order", -20);
            invalidRealmNames.add("xpack.security.authc.realms.file._default_file");
        } else {
            builder.put("xpack.security.authc.realms.file.default_file.order", -20);