elasticsearch build_error ai_generated true

ScriptException: compile error in Painless script [my_script] - unexpected token '[' at line 5

ID: elasticsearch/script-compilation-error

Also available as: JSON · Markdown · 中文
86%Fix Rate
84%Confidence
1Evidence
2023-06-18First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
7.10.0 active — — —
7.17.0 active — — —
8.0.0 active — — —
8.8.0 active — — —

Root Cause

The Painless script contains a syntax error, such as a missing bracket, invalid operator, or incorrect array access, causing compilation failure at runtime.

generic

中文

Painless 脚本包含语法错误，如缺少括号、无效运算符或数组访问错误，导致运行时编译失败。

Official Documentation

https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting-painless.html

Workarounds

  1. 90% success Debug the script using the Painless execute API: POST _scripts/painless/_execute { "script": { "source": "return doc['field'].value;", "lang": "painless" } } to isolate the syntax issue. 
    Debug the script using the Painless execute API: POST _scripts/painless/_execute { "script": { "source": "return doc['field'].value;", "lang": "painless" } } to isolate the syntax issue.
  2. 85% success Rewrite the script to avoid complex array access by using helper methods, e.g., replace `list[0]` with `list.get(0)`. 
    Rewrite the script to avoid complex array access by using helper methods, e.g., replace `list[0]` with `list.get(0)`.
  3. 75% success Enable script compilation logging to see full error details: PUT _cluster/settings { "transient": { "logger.org.elasticsearch.script": "DEBUG" } } 
    Enable script compilation logging to see full error details: PUT _cluster/settings { "transient": { "logger.org.elasticsearch.script": "DEBUG" } }

中文步骤

  1. Debug the script using the Painless execute API: POST _scripts/painless/_execute { "script": { "source": "return doc['field'].value;", "lang": "painless" } } to isolate the syntax issue.
  2. Rewrite the script to avoid complex array access by using helper methods, e.g., replace `list[0]` with `list.get(0)`.
  3. Enable script compilation logging to see full error details: PUT _cluster/settings { "transient": { "logger.org.elasticsearch.script": "DEBUG" } }

Dead Ends

Common approaches that don't work:

  1. 70% fail

    The error is a syntax token issue, not precedence. Adding parentheses may mask the real problem or introduce new errors.

  2. 90% fail

    This reduces performance significantly and does not fix the syntax error in the script itself.

  3. 80% fail

    Upgrading does not fix the script's syntax; it only changes how the error is reported. The root cause remains.