Active threads in Thread pool is not changing

Hi,I'm new to elasticsearch and currently i'm facing an issue of 'es_rejected_execution_exception'.I just checked the thread pool by _cat/thread_pool?v.
here I can see,(only one is mentioned here)
node_name name active queue rejected search 13 914 907

This active thread is still 13 while i'm not using elasticsearch query or anything...why ?And i'm facing the same exception...Whats the actual problem...?

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