Fix NullPointerException

✅ Solution

NullPointerException errors in Elasticsearch/ESQL often arise when accessing fields that are either missing or have null values in the Elasticsearch documents being processed, especially with features like `unmapped_fields="load"` or `FORK`. To fix this, add explicit null checks before accessing potentially null fields, employing the `COALESCE` function or conditional logic (e.g., `CASE WHEN field IS NULL THEN ... ELSE ... END`) within your ESQL queries to provide default values or skip operations when encountering nulls. Ensure your Java code interacting with Elasticsearch gracefully handles null responses from the client before dereferencing them.