[Python] TypeError: 'ObjectApiResponse' object does not support item assignment

I am making an api in python to link it with elasticsearch but when executing it, it generates an error on line 23 res['ST'] = search_term which translates as 'ObjectApiResponse' object does not support item assignment, I appreciate your help and collaboration

from flask import Flask, render_template, request
from elasticsearch import Elasticsearch
import os

os.chdir('/home/ambu/Documents/search')
app: Flask = Flask(__name__, template_folder='templates')
es = Elasticsearch("http://127.0.0.1:9200")


@app.route('/')
def index():
return render_template('search.html')


@app.route('/search/results', methods=['GET', 'POST'])
def request_search():
search_term = request.form["input"]
res = es.search(
index='data_example4',
body={
"query": {"match": {"content": search_term}},
"highlight": {"pre_tags": ["<b>"], "post_tags": ["</b>"], "fields": {"content": {}}}})
res['ST'] = search_term
for hit in res['hits']['hits']:
hit['good_summary'] = '….'.join(hit['highlight']['content'][1:])
return render_template('results.html', res=res)


if __name__ == '__main__':
app.run('127.0.0.1', debug=True)


Thank you for your help to solve this problem.

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