Logstash not pushing past Queued data to AWS elasticsearch but is able to send current logs being pushed into

ELS versions : ES 5.5 as service on AWS and Logstash 5.5.3 on EC2 instance
ES had issue with heapspace due to which Queue in Logstash got filled up, After we upgraded ES from small to medium instance Logstash is able to push new logs to ES but it is not able to push old queued data, I can see the size of data folder in Logstash of 1 gb.
I have following setting for logstash -
queue.type: persisted
queue.page_capacity: 1024mb
queue.max_bytes: 2048mb
queue.checkpoint.acks: 0
queue.checkpoint.writes: 0

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