Creating and using custom functions in painless

[stephenb (Stephen Brown)]

I am not good at painless either but have done a little.

First question: are you trying to use in an ingest pipeline ..what is the context?

2. Definitely look at the docs here

The example in detail here that shows the proper way to define a function you are missing the defs

def addwords(def id, def words) {

3 you can use the Dev Tools - Painless debugger to work on syntax

def addwords(def id, def words) {
    String[] fiiled2 = new String[] {'foo','bar','word1'};
    if (id.equals(1)) {
      return fiiled2[id];
    }
    return words[id];
}

String[] words_var1 = new String[] {'word1','word1','word1'};
addwords(1, words_var1);

So you can use the debugger you will just need to substitute the context variables with some locals to debug ... then switch back to _ctx.