Continuous transform failure

Elastic Stack Elasticsearch
1

I have 4GB JVM heap and continuous transform with filtered search throws this errors in logs and stops with "failed" state after some period.

Insufficient memory for search, reducing number of buckets per search from [43] to [36]
...
Insufficient memory for search after repeated page size reductions to [10], unable to continue pivot, please simplify job or increase heap size on data nodes.

Do i need to increase heap or i need to remove query from transform, i'm filtering data by year through query in transform, maybe absence of query will decrease heap usage?

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