How to use autoindex data in my search keyword logic?

Here is my code for searching a keyword in Docx files present in the folder. It should show all the Docx files which contain the keyword. But here when I use AutoIndex it only showing the whole directory as the output and I want that the directory should go in my logic and provide the Docx files which have that keyword present.

from flask import Flask, render_template, request
from flask_autoindex import AutoIndex

from docx import *
import re
import os

app = Flask(__name__,template_folder='templates')

directory="C:/Users/nanis/Downloads/New folder"

AutoIndex(app, browse_root=directory) 



@app.route("/")
def index():
  return render_template("home.html")


@app.route('/search',methods=["POST"])
def search():
    if request.method=="POST":
        keyword=request.form["text"]
    
        for filename in os.listdir(directory):
            if filename.endswith(".docx"):
                z= os.path.join(directory, filename)


                with open(z,"rb") as f:
                    document=Document(f)
                    body_element=document._body._body
                    if (re.findall(keyword,body_element.xml)):
                        a=keyword +" is present in this file ", filename
                   

                        return render_template("search.html",i=a)

if __name__ == "__main__":
   app.run(debug=True)