update a particular field of elasticsearch document - elasticsearch

Question

Hi I am trying to update documents a elasticsearch which meets specific criteria. I am using google sense(chrome extension) for making request. The request that I am making is as shown below:
GET styling_rules2/product_line_filters/_update
{
"query": {
"filtered": {
"query": {
"bool": {
"should": [
{"term":{"product_line_attribute": "brand"}}
],
"minimum_should_match": 1
}
},
"filter": {
"term": {
"product_line_name": "women_skirts"
}
}
}
},
"script" : "ctx._source.brand=brands"
}
sample document is as shown below:
{
"product_line_attribute_db_path": "product_filter.brand",
"product_line_attribute": "brand",
"product_line_name": "women_skirts",
"product_line_attribute_value_list": [
"vero moda",
"faballey",
"only",
"rider republic",
"dorothy perkins"
]
}
desired result: update all the document which has product_line_attribute="brand" and product_line_name="women_skirts" to product_line_attribute="brands".
problem: I am getting the error as follows:
{
"error": {
"root_cause": [
{
"type": "search_parse_exception",
"reason": "failed to parse search source. unknown search element [script]",
"line": 18,
"col": 4
}
],
"type": "search_phase_execution_exception",
"reason": "all shards failed",
"phase": "query",
"grouped": true,
"failed_shards": [
{
"shard": 0,
"index": "styling_rules2",
"node": "2ijp1pXwT46FN4on4-JPlg",
"reason": {
"type": "search_parse_exception",
"reason": "failed to parse search source. unknown search element [script]",
"line": 18,
"col": 4
}
}
]
},
"status": 400
}
thanks in advance!

Answer 1

You should use the _update_by_query endpoint and not _update. Also the script section is not correct, which is probably why you're getting a class_cast_exception.
Try this instead:
POST styling_rules2/product_line_filters/_update_by_query
{
"query": {
"filtered": {
"query": {
"bool": {
"should": [
{
"term": {
"product_line_attribute": "brand"
}
}
],
"minimum_should_match": 1
}
},
"filter": {
"term": {
"product_line_name": "women_skirts"
}
}
}
},
"script": {
"inline": "ctx._source.brand=brands"
}
}