### Description

We now support storing KNN vectors as part of our indexed data.  These vectors should be included in the disk usage API.
server/src/main/java/org/elasticsearch/action/admin/indices/diskusage/IndexDiskUsageAnalyzer.java
final Map<String, Long> fields = new HashMap<>();
        private PostingsEnum docsAndPositions; 
        void visitField(Fields vectors, String fieldName) throws IOException {
            final Terms terms = vectors.terms(fieldName);
            if (terms == null) {
                return;
            }
            final boolean hasPositions = terms.hasPositions();
            final boolean hasOffsets = terms.hasOffsets();
            final boolean hasPayloads = terms.hasPayloads();
            assert hasPayloads == false || hasPositions;
            long fieldLength = 1; 
            final TermsEnum termsEnum = terms.iterator();
            BytesRef bytesRef;
            while ((bytesRef = termsEnum.next()) != null) {
                cancellationChecker.logEvent();