src/main/java/org/opensearch/security/securityconf/ConfigModelV6.java [746:773]:
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        private Set<String> getResolvedIndexPattern(User user, IndexNameExpressionResolver resolver, ClusterService cs) {
            String unresolved = getUnresolvedIndexPattern(user);
            WildcardMatcher matcher = WildcardMatcher.from(unresolved);
            String[] resolved = null;
            if (!(matcher instanceof WildcardMatcher.Exact)) {
                final String[] aliasesForPermittedPattern = cs.state().getMetadata().getIndicesLookup().entrySet().stream()
                        .filter(e -> e.getValue().getType() == ALIAS)
                        .filter(e -> matcher.test(e.getKey()))
                        .map(e -> e.getKey())
                        .toArray(String[]::new);

                if (aliasesForPermittedPattern.length > 0) {
                    resolved = resolver.concreteIndexNames(cs.state(), IndicesOptions.lenientExpandOpen(), aliasesForPermittedPattern);
                }
            }

            if (resolved == null && !unresolved.isEmpty()) {
                resolved = resolver.concreteIndexNames(cs.state(), IndicesOptions.lenientExpandOpen(), unresolved);
            }
            if (resolved == null || resolved.length == 0) {
                return ImmutableSet.of(unresolved);
            } else {
                return ImmutableSet.<String>builder()
                    .addAll(Arrays.asList(resolved))
                    .add(unresolved)
                    .build();
            }
        }
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src/main/java/org/opensearch/security/securityconf/ConfigModelV7.java [742:769]:
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        private Set<String> getResolvedIndexPattern(User user, IndexNameExpressionResolver resolver, ClusterService cs) {
            String unresolved = getUnresolvedIndexPattern(user);
            WildcardMatcher matcher = WildcardMatcher.from(unresolved);
            String[] resolved = null;
            if (!(matcher instanceof WildcardMatcher.Exact)) {
                final String[] aliasesForPermittedPattern = cs.state().getMetadata().getIndicesLookup().entrySet().stream()
                        .filter(e -> e.getValue().getType() == ALIAS)
                        .filter(e -> matcher.test(e.getKey()))
                        .map(e -> e.getKey())
                        .toArray(String[]::new);

                if (aliasesForPermittedPattern.length > 0) {
                    resolved = resolver.concreteIndexNames(cs.state(), IndicesOptions.lenientExpandOpen(), aliasesForPermittedPattern);
                }
            }

            if (resolved == null && !unresolved.isEmpty()) {
                resolved = resolver.concreteIndexNames(cs.state(), IndicesOptions.lenientExpandOpen(), unresolved);
            }
            if (resolved == null || resolved.length == 0) {
                return ImmutableSet.of(unresolved);
            } else {
                return ImmutableSet.<String>builder()
                        .addAll(Arrays.asList(resolved))
                        .add(unresolved)
                        .build();
            }
        }
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