### Elasticsearch Version

master

### Installed Plugins

N/A

### Java Version

_bundled_

### OS Version

N/A

### Problem Description

@arteam [observed](https://github.com/elastic/elasticsearch/pull/83221/files#r795474431) that `static record` is redundant, records are apparently implicitly static. I think we should make sure that Checkstyle picks this up rather than needing human involvement.

### Steps to Reproduce

Mark a record declaration as `static` and observe that `./gradlew precommit` still passes.

### Logs (if relevant)

_No response_
server/src/main/java/org/elasticsearch/cluster/routing/IndexRouting.java
Unpartitioned(IndexMetadata metadata) {
            super(metadata);
        }
        @Override
        protected int shardId(String id, @Nullable String routing) {
            return hashToShardId(effectiveRoutingToHash(routing == null ? id : routing));
        }
        @Override
        public void collectSearchShards(String routing, IntConsumer consumer) {
            consumer.accept(hashToShardId(effectiveRoutingToHash(routing)));
        }
    }
    /**
     * Strategy for partitioned indices.
     */
    private static class Partitioned extends IdAndRoutingOnly {