public String[] getPostTags() {
        return postTags;
    }

    /**
     * Sets the custom post-tags for highlighting with fluent interface.
     *
     * @param postTags the post-tags to set
     * @return this HighlightInfo instance for method chaining
     */
    public HighlightInfo postTags(final String... postTags) {
        this.postTags = postTags;
        return this;
    }

            final String[] preTags = highlightInfo.getPreTags();
            final String[] postTags = highlightInfo.getPostTags();
            if (preTags != null) {
                highlightBuilder.preTags(preTags);
            }
            if (postTags != null) {
                highlightBuilder.postTags(postTags);
            }
            queryFieldConfig.highlightedFields(

                    .numOfFragments(Integer.parseInt(fessConfig.getOrDefault("rag.chat.highlight.number.of.fragments", "3")))
                    .preTags(StringUtil.EMPTY)
                    .postTags(StringUtil.EMPTY);
        }

        @Override
        public String getSort() {
            return null;
        }

        @Override
        public int getStartPosition() {

        if (tagList != null) {
            posTags.addAll(tagList);
        }
    }

    @Override
    public TokenStream create(final TokenStream tokenStream) {
        final PartOfSpeechAttribute posAtt = tokenStream.addAttribute(PartOfSpeechAttribute.class);
        return new PosConcatenationFilter(tokenStream, posTags, () -> posAtt.getPartOfSpeech());
    }