Fix compilation error by import org.apache.lucene.util.BytesRef;
Fix PMD warning: don't reassign method parameters.
[TEST] Make sure that there are no relocating shards before taking snapshot

Temporary workaround for #5531
[TEST] Added extra test for multi fields with default `include_in_all` settings, in which only the main field should end up in the `_all` field.
add uppercase token filter

closes #5539
Capture and set start time in Delete By Query operations

This is important for queries/filters that use `now` in date based queries/filters

Closes #5540