AtomicArrays can only be copied to arrays of the same size – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when there’s an attempt to copy an AtomicArray to another array of a different size in Elasticsearch. This is not allowed as AtomicArrays must be copied to arrays of the same size. To resolve this issue, ensure that the destination array is of the same size as the AtomicArray. If the sizes are different, you may need to resize the destination array or adjust the size of the data being copied to match the destination array size.

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This guide will help you check for common problems that cause the log ” AtomicArrays can only be copied to arrays of the same size ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “AtomicArrays can only be copied to arrays of the same size” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 * Copies the content of the underlying atomic array to a normal one.
 public E[] toArray(E[] a) {
 if (a.length != array.length()) {
 throw new ElasticsearchGenerationException("AtomicArrays can only be copied to arrays of the same size");
 for (int i = 0; i < array.length(); i++) {
 a[i] = array.get(i);
 return a;


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