Fix StringIndexOutOfBoundsException

✅ Solution

StringIndexOutOfBoundsException in Logstash Grok filters typically occurs when the grok pattern attempts to access a substring beyond the actual length of the input string. To fix this, carefully review your grok patterns, especially those with optional or repeated elements, ensuring they correctly account for variations in input string length and structure, preventing out-of-bounds access. Use conditionals or anchors to guide the expression to the correct starting/ending point.