Fix NullPointerException

✅ Solution

NullPointerException in Elasticsearch often arises from accessing an object or variable that hasn't been initialized or is unexpectedly null. To fix this, carefully inspect the code for potential null values before dereferencing them, and add appropriate null checks (e.g., `if (object != null)`) or initialize variables with default values to prevent null assignments. Additionally, review exception stack traces to pinpoint the exact line of code where the null value is being accessed to guide the implementation of targeted null checks.