Native script inconsistent (not found)

Elastic Stack Elasticsearch
1

I was given a development cluster with 2 nodes, there're about 700 indexes there. I installed a plugin and it works very inconsistently. Sometimes it works normally, sometimes when I modify the code a bit, I can build and install the new code successfully but when I run query, it throws an error that "Native script [abc] not found". Then I modify the code and install again, it works again. Note again that there was no error every time I install the plugin. And of course I did restart elastic every time I install the plugin. Can anyone help pinpoint the possible reason for that behavior? Thanks a lot.

Btw I'm using Elasticsearch 1.7 and the cluster's health status is always yellow!

2

You haven't given us much to really go on.

What errors did you get, the exact error?
What does the script look like?
What does your ES config look like?

3

Hi Mark, here's the cluster's health:
{
"cluster_name" : "searchme",
"status" : "yellow",
"timed_out" : false,
"number_of_nodes" : 2,
"number_of_data_nodes" : 2,
"active_primary_shards" : 3711,
"active_shards" : 3711,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 3711,
"number_of_pending_tasks" : 0
}

Currently I am testing the Cosine Similarity Script by Imotov on github:

And here's the error I got:

nested: QueryParsingException[[example_index] script_score the script could not be loaded]; nested: ElasticsearchIllegalArgumentException[Native script [cosine_sim_script_score] not found]

4

That's a pretty crazy number of shards you have, why so many? And why are so many unassigned?

Anyway, ES says it cannot find the script, so where did you place it?

5

It's a development cluster so quite a few people used/are using it to test and might forget to delete their data in the end.

The plugin is put in elastic/plugins along with other plugins. Like I said, sometimes it was able to find the script, but sometimes just wasn't.

Btw, if I already have the plugin installed, then I modify the code a little bit, rebuild, then reinstall, the plugin name still stays the same, do I have to restart Elasticsearch? Currently I restart elastic every time I install even though some time the change is very minor.