value] cannot be changed from [keyword] to [text]. Briefly, this error occurs when you try to change the data type of an existing field in Elasticsearch. Elasticsearch does not allow changing the data type of a field once it has been created. To resolve this issue, you can either create a new index with the correct mappings or reindex your data into a new index with the correct mappings. Alternatively, you can add a new field with a different name and the desired data type to the existing index.
This guide will help you check for common problems that cause the log ” Property [value] of field [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “Property [value] of field [” class name is ConstantKeywordFieldMapper.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
value = node.remove("value");
if (value == null) {
throw new MapperParsingException("Property [value] of field [" + name + "] can't be [null].");
}
if (value instanceof Number == false && value instanceof CharSequence == false) {
throw new MapperParsingException("Property [value] of field [" + name +
"] must be a number or a string; but got [" + value + "]");
}
}
ConstantKeywordFieldMapper.Builder builder = new ConstantKeywordFieldMapper.Builder(name);
if (value != null) {
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