[Python] Get telegram's chat's history

I want to get some previoius messages from chat with Python telegram bot's library.

Here is my bot's handler:

class BotController:
def __init__(self) -> None:
self.token = os.getenv("TELEGRAM_BOT_TOKEN")
self.application = ApplicationBuilder().token(self.token).connection_pool_size(20).build()

def launch(self) -> None:
self.add_handlers()
self.application.run_polling()
logger.info("BOT LAUNCHED")

def add_handlers(self):
self.application.add_handler(MessageHandler(filters=filters.TEXT, callback=menu_callback))


Menu callback:

...
async def menu_callback(update: Update, context: ContextTypes.DEFAULT_TYPE):
client = await get_client(update)
logger.error(client.stage)

match client.stage:
case Stage.some_stage:
logger.error(update.message.text)
logger.error(update.message)
updates = await update._bot.get_updates()

for update in updates:
logger.error(update)
logger.error(update.message)
last_update_id = update.update_id
...


But here I got

telegram.error.TimedOut: All connections in the connection pool are occupied. Request was not sent to Telegram. Consider adjusting the connection pool size or the pool timeout.
​

How can I get chat history? Is it possible?

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