### Elasticsearch Version

main

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

all

### Problem Description

The `filter` agg should run as `filters` because the `filters` agg has tons of optimizations, some of them are even around when running with a single filter. At a minimum we should optimize the `filter` agg in the same way as `filters`, but I think it's easier if we just run it as `filters`.

### Steps to Reproduce

see above

### Logs (if relevant)

_No response_
server/src/main/java/org/elasticsearch/search/aggregations/bucket/composite/CompositeAggregationBuilder.java
builder.field(SIZE_FIELD_NAME.getPreferredName(), size);
        builder.startArray(SOURCES_FIELD_NAME.getPreferredName());
        for (CompositeValuesSourceBuilder<?> source : sources) {
            CompositeValuesSourceParserHelper.toXContent(source, builder, params);
        }
        builder.endArray();
        if (after != null) {
            CompositeAggregation.buildCompositeMap(AFTER_FIELD_NAME.getPreferredName(), after, builder);
        }
        builder.endObject();
        return builder;
    }
    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), sources, size, after);
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null || getClass() != obj.getClass()) return false;
        if (super.equals(obj) == false) return false;
        CompositeAggregationBuilder other = (CompositeAggregationBuilder) obj;
        return size == other.size && Objects.equals(sources, other.sources) && Objects.equals(after, other.after);
    }
    @Override
    public Version getMinimalSupportedVersion() {
        return Version.V_EMPTY;
    }
}