return nil
	}
	return map[string]string{fmt.Sprintf("%s-metacache-part-%d", ReservedMetadataPrefixLower, b.n): string(v)}
}

// pastPrefix returns true if the given prefix is before start of the block.
func (b metacacheBlock) pastPrefix(prefix string) bool {
	if prefix == "" || strings.HasPrefix(b.First, prefix) {
		return false
	}
	// We have checked if prefix matches, so we can do direct compare.

	// Filter
	if !o.Recursive {
		entries.o = make(metaCacheEntries, 0, o.Limit)
		pastPrefix := false
		err := r.readFn(func(entry metaCacheEntry) bool {
			if o.Prefix != "" && !strings.HasPrefix(entry.name, o.Prefix) {
				// We are past the prefix, don't continue.
				pastPrefix = true
				return false
			}

        } catch (OpenSearchStatusException | IllegalStateException e) {
            final String lastPrefix = isLast ? "last " : "";
            final String typeDesc = useReading ? "reading " : "";
            if (logger.isDebugEnabled()) {
                logger.warn("Failed to analyze {}{}text: field={}, lang={}, textSize={}", lastPrefix, typeDesc, field, lang, buf.length(),
                        e);
            } else {