Briefly, this error occurs when Elasticsearch tries to parse an email template but encounters an empty field. This could be due to a missing or incorrectly formatted field in the email template. To resolve this issue, you should first check the email template for any empty or incorrectly formatted fields. Ensure that all required fields are present and correctly formatted. If the error persists, try to validate the email template using a JSON validator to identify any syntax errors. Lastly, consider recreating the email template if the error still exists.
This guide will help you check for common problems that cause the log ” could not parse email template. empty [{}] field ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, template.
If you want to learn more about Elasticsearch templates, check out this guide.
Overview
A template in Elasticsearch falls into one of the two following categories and is indexed inside Elasticsearch using its dedicated endpoint:
- Index templates, which are a way to define a set of rules including index settings, mappings and an index pattern. The template is applied automatically whenever a new index is created with the matching pattern. Templates are also used to dynamically apply custom mapping for the fields which are not predefined inside existing mapping.
- Search templates, which help in defining templates for search queries using mustache scripting language. These templates act as a placeholder for variables defined inside the search queries.
Examples
Create a dynamic index template
PUT /_template/template_1?pretty
{
"index_patterns": [
"logs*",
"api*"
],
"settings": {
"number_of_shards": 2
},
"mappings": {
"dynamic_templates": [
{
"strings": {
"match_mapping_type": "string",
"mapping": {
"type": "keyword"
}
}
}
],
"properties": {
"host_name": {
"type": "keyword"
},
"created_at": {
"type": "date"
}
}
}
}Create a search template
POST /_scripts/search_template_1?pretty
{
"script": {
"lang": "mustache",
"source": {
"query": {
"match": {
"description": "{{query_string}}"
}
}
}
}
}Executing a search query using search template
GET /_search/template?pretty
{
"id": "search_template_1",
"params": {
"query_string": "hello world"
}
}The search request will be executed by default on all the indices available in the cluster and can be limited to particular indices using an index parameter.
Notes
- A dynamic index template is always useful when you do not know the field names in advance and want to control their mapping as per the business use case.
Log Context
Log “could not parse email template. empty [{}] field” class name is EmailTemplate.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
String currentFieldName = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (currentFieldName == null) {
throw new ElasticsearchParseException("could not parse email template. empty [{}] field"; fieldName);
} else if (Email.Field.BODY_TEXT.match(currentFieldName; parser.getDeprecationHandler())) {
builder.textBody(TextTemplate.parse(parser));
} else if (Email.Field.BODY_HTML.match(currentFieldName; parser.getDeprecationHandler())) {
builder.htmlBody(TextTemplate.parse(parser));
} else {
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