Description
Describe the bug
( index_prefixes is not documented in OpenSearch’s documentation but AFAIK OpenSearch is compatible with ElasticSearch 7.10, which has index_prefixes parameter.)
When a prefix query run on a field with index_prefixes, if the length of characters in the query is [min_chars of the index_prefixes option] - 1, an error is responded.
The root cause seems to be NullPointerException.
To Reproduce
Steps to reproduce the behavior:
- Create an index which has a field with
index_prefixesoption; itsmin_charsis implicitly 2.
PUT test
{
"mappings": {
"properties": {
"t": {
"type": "text",
"index_prefixes": {}
}
}
}
}
- Search by
prefixquery with one character on the field.
GET test/_search
{"query":{"prefix":{"t": "a"}}}
- An error is responded. It says the root cause is NullPointerException.
{
"error" : {
"root_cause" : [
{
"type" : "query_shard_exception",
"reason" : "failed to create query: Cannot invoke \"Object.hashCode()\" because \"this.rewriteMethod\" is null",
"index" : "test",
"index_uuid" : "XPqfSP1xT7WJt9Sxzt65qg"
}
],
"type" : "search_phase_execution_exception",
"reason" : "all shards failed",
"phase" : "query",
"grouped" : true,
"failed_shards" : [
{
"shard" : 0,
"index" : "test",
"node" : "QA35rulpSza20Wsx6rNSEg",
"reason" : {
"type" : "query_shard_exception",
"reason" : "failed to create query: Cannot invoke \"Object.hashCode()\" because \"this.rewriteMethod\" is null",
"index" : "test",
"index_uuid" : "XPqfSP1xT7WJt9Sxzt65qg",
"caused_by" : {
"type" : "null_pointer_exception",
"reason" : "Cannot invoke \"Object.hashCode()\" because \"this.rewriteMethod\" is null"
}
}
}
]
},
"status" : 400
}- simple_query_string also fails.
# fails with the same error
GET test/_search
{"query":{"simple_query_string":{"fields":["t"], "query":"a*"}}}
Expected behavior
Run without errors. I know it is not efficient.
A similar query_string runs without any errors.
GET test/_search
{"query":{"query_string":{"fields":["t"], "query":"a*"}}}
I tried some patterns (min_chars = 2, 3, 5), and it seems that the prefix query with characters the length of which is min_chars - 1 fails. When the length is less than min_chars - 1, the query succeeds.
Plugins
N/A
Screenshots
N/A
Host/Environment (please complete the following information):
- Version: 1.3.1
Additional context
Add any other context about the problem here.
Activity