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Briefly, this error occurs when OpenSearch encounters a data type in the context array that it doesn’t expect. OpenSearch expects string, number, or boolean values, but it has found a different data type, referred to as a ‘token’. To resolve this issue, you should check the data you’re sending to OpenSearch and ensure that all values in the context array are of the correct type. If you’re using a programming language to send data, ensure that it’s correctly converting data types before sending them to OpenSearch.
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This guide will help you check for common problems that cause the log ” context array must have string; number or boolean values; but was [” + token + “] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: search.
Quick links
Overview
Search refers to the searching of documents in an index or multiple indices. The simple search is just a GET API request to the _search endpoint. The search query can either be provided in query string or through a request body.
Examples
When looking for any documents in this index, if search parameters are not provided, every document is a hit and by default 10 hits will be returned.
GET my_documents/_search
A JSON object is returned in response to a search query. A 200 response code means the request was completed successfully.
{
"took" : 1,
"timed_out" : false,
"_shards" : {
"total" : 2,
"successful" : 2,
"failed" : 0
},
"hits" : {
"total" : 2,
"max_score" : 1.0,
"hits" : [
...
]
}
}Notes and good things to know
- Distributed search is challenging and every shard of the index needs to be searched for hits, and then those hits are combined into a single sorted list as a final result.
- There are two phases of search: the query phase and the fetch phase.
- In the query phase, the query is executed on each shard locally and top hits are returned to the coordinating node. The coordinating node merges the results and creates a global sorted list.
- In the fetch phase, the coordinating node brings the actual documents for those hit IDs and returns them to the requesting client.
- A coordinating node needs enough memory and CPU in order to handle the fetch phase.
Log Context
Log “context array must have string; number or boolean values; but was [” + token + “]” class name is CategoryContextMapping.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :
} else if (token == Token.START_ARRAY) {
while ((token = parser.nextToken()) != Token.END_ARRAY) {
if (token == Token.VALUE_STRING || token == Token.VALUE_NUMBER || token == Token.VALUE_BOOLEAN) {
contexts.add(parser.text());
} else {
throw new OpenSearchParseException("context array must have string; number or boolean values; but was [" + token + "]");
}
}
} else {
throw new OpenSearchParseException(
"contexts must be a string; number or boolean or a list of string; number or boolean; but was [" + token + "]"
