[BUG] default behavior is to refresh after batches. This should be removed

[wbeckler]

What is the bug?

When OPENSEARCH_BATCH_WRITE_REFRESH_DEFAULT = "true", the client will trigger a global refresh command. this forces a refresh of all indexes, even read-only ones, which results in an error. A refresh should be per index. This default setting is dangerous and was initially added to make the client more debuggable. It would be a better experience if the default were set to false, so as to remove this latent bug that eventually causes issues.

opensearch-hadoop/mr/src/main/java/org/opensearch/hadoop/cfg/ConfigurationOptions.java

Line 97 in 203d53f

String OPENSEARCH_BATCH_WRITE_REFRESH_DEFAULT = "true";

[mukhtarGeo]

Hi, This issue happened to us when using default settings of hadoop-client which sets the refresh as "true". Pls set the default to false so write operations into index do not fail.