private boolean checkIndexRuleProcessed(String modelName, IndexRule indexRule) {
        Map<String, IndexRule> rules = groupIndexRules.computeIfAbsent(
            indexRule.getMetadata().getGroup(), k -> new HashMap<>());
        IndexRule existRule = rules.get(indexRule.getMetadata().getName());
        if (existRule != null) {
            checkIndexRuleConflicts(modelName, indexRule, existRule);
            return true;
        } else {
            rules.put(indexRule.getMetadata().getName(), indexRule);
            return false;
        }
    }
Check if the index rule has been processed.
If the index rule has been processed, return true.
Otherwise, return false and mark the index rule as processed.
oap-server/server-storage-plugin/storage-banyandb-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/banyandb/BanyanDBIndexInstaller.java