[BUG] NPE happens on short prefix query on a field with index_prefixes
#2826
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@woby looks like a bug - if you/someone wants to contribute a unit test for this we can fix it faster |
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I took a stab at this to understand the problem. I did observe similar pattern as @woby. I did the tests and only 3. (min_chars -1) is seeing problems. Also a side note, Lucene throws a null pointer exception but OpenSearch handles it and does not crash. Which says, it only impacts this feature as a customer, but does not take down the cluster fatally. Setting up the index:
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Thanks @VachaShah for taking care of this. @woby the changes are merged to 2.0 and will be available in the next release. |
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Describe the bug
(
index_prefixesis not documented in OpenSearch’s documentation but AFAIK OpenSearch is compatible with ElasticSearch 7.10, which has index_prefixes parameter.)When a
prefixquery run on a field withindex_prefixes, if the length of characters in the query is [min_charsof theindex_prefixesoption] - 1, an error is responded.The root cause seems to be NullPointerException.
To Reproduce
Steps to reproduce the behavior:
index_prefixesoption; itsmin_charsis implicitly 2.prefixquery with one character on the field.{ "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 }Expected behavior
Run without errors. I know it is not efficient.
A similar
query_stringruns without any errors.I tried some patterns (
min_chars= 2, 3, 5), and it seems that the prefix query with characters the length of which ismin_chars- 1 fails. When the length is less thanmin_chars- 1, the query succeeds.Plugins
N/A
Screenshots
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Host/Environment (please complete the following information):
Additional context
Add any other context about the problem here.
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