So that you don't DOS your Jira instance. Pulling 1000 issues out of Jira is expensive and likely places unnecessary load on your system. Doing this regularly will be something your human users will feel and cause them to complain about performance.
You can pass a JQL query via REST, which will allow you to pull only the data that you actually need out of Jira. This places much less load on Jira and saves you the need you remove the garbage that you don't want anyway.
If you must raise the amount, you can make the following change and restart Jira.
If you had to thrive a new habit during a lockdown, what would it be? Trello
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