failed to execute script Elasticsearch

Question

I am trying to update the some values in a particular field, which I want to be unique.

But when I give the script the condition .unique() it returns me an error.

If I do not give the condition unique then it's keep updating again and again. Means the value will be

update_field= array ('world','values','frost','world','values','frost',...)

What I am doing wrong here anyone knows !!!

        $script['script'] = 'ctx._source.update_field = (ctx._source.update_field + new_value).unique()';
        // unique() is giving the error but why

error message ---

{"error":"ElasticsearchIllegalArgumentException[failed to execute script]; nested: GroovyScriptExecutionException[MissingMethodException[No signature of method: java.lang.String.unique() is applicable for argument types: () values: []\nPossible solutions: minus(java.lang.Object), minus(java.util.regex.Pattern), minus(java.lang.Object), size(), size(), use([Ljava.lang.Object;)]]; ","status":400}

a sample documents ---

    hits: {
        total: 19,
        max_score: 5.5197725,
        hits: [
            {
                _index: "myIndex",
                _type: "myType",
                _id: "pdd9da099f380b3951a627a5d5a38758680016f16",
                _score: 5.5197725,
                _source: {
                    content: "After shooting attacks are several police cars sent to the streets to watch. 
                    title: "The police in Copenhagen when bødemål despite extra tasks",
                    update_field: "[funny]"

            }},}

So there you can see that the update_field is not empty and have some value - when when i try ---

$script['script'] = 'ctx._source.update_field = ((ctx._source.update_field ?: []) - new_value).unique()';

it also returns me the same error ! don't know why !!

Val · Accepted Answer · 2015-09-27 08:35:28Z

1

From the error, the key point is No signature of method: java.lang.String.unique(). It's probably because update_field does not exist or is empty at some point and thus the + operator will simply try to concatenate it as a string with the array you're specifying.

One way to fix this would be to make sure update_field is considered as an array no matter what. You should be able to achieve this by replacing ctx._source.update_field with (ctx._source.update_field ?: []), that way if update_field does not exist or is empty, then an empty array will be used instead and the + operator will work on an array instead of on a string field.

$script['script'] = 'ctx._source.update_field = ((ctx._source.update_field ?: []) + new_value).unique()';

answered Sep 27, 2015 at 8:35

Val

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4 Comments

Istiak Mahmood Over a year ago

thanks for your answer and explanation, but it is also return me the same error, i have also update my question with a sample document, can you kindly have a look, thanks a lot

Val Over a year ago

You probably need to wipe your myIndex index and recreate it, because your update_field has already been indexed as a string, i.e. "[funny]".

Istiak Mahmood Over a year ago

@oops my bad, thanks a lot Val, thanks a lot for your help :), you are awesome

Istiak Mahmood Over a year ago

i have reindex my documents and it is working perfectly, thanks a lot for your help again :)

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