Fix test and add to CHANGELOG

Signed-off-by: Craig Perkins <cwperx@amazon.com>

Author: cwperks

CHANGELOG.md

@@ -8,6 +8,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ### Changed
 - Ensure all restHeaders from ActionPlugin.getRestHeaders are carried to threadContext for tracing ([#5396](https://github.com/opensearch-project/security/pull/5396))
+- Deprecate plugins.security.system_indices.indices ([#5775](https://github.com/opensearch-project/security/pull/5775))
+
 ### Features
 
 ### Enhancements

src/test/java/org/opensearch/security/tools/democonfig/SecuritySettingsConfigurerTests.java

@@ -252,7 +252,7 @@ public void testConfigFileDoesNotExist() {
     public void testBuildSecurityConfigMap() {
         Map<String, Object> actual = securitySettingsConfigurer.buildSecurityConfigMap();
 
-        assertThat(actual.size(), is(17));
+        assertThat(actual.size(), is(16));
         assertThat(actual.get("plugins.security.ssl.transport.pemcert_filepath"), equalTo(Certificates.NODE_CERT.getFileName()));
         assertThat(actual.get("plugins.security.ssl.transport.pemkey_filepath"), equalTo(Certificates.NODE_KEY.getFileName()));
         assertThat(actual.get("plugins.security.ssl.transport.pemtrustedcas_filepath"), equalTo(Certificates.ROOT_CA.getFileName()));