`200` response with even though response body is error

I am doing a string query POST with intentional syntax error "heart(":

Full POST request:

Request URL: http://192.168.136.128:9200/image/_msearch?
Request Method: POST
Status Code: 200 OK
Remote Address: 192.168.136.128:9200
Referrer Policy: no-referrer-when-downgrade
accept: application/json
content-type: application/x-ndjson
Origin: http://192.168.136.128:3000
Referer: http://192.168.136.128:3000/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36
x-requested-with: 771100

{"preference":"modality-list"}
{"query":{"bool":{"must":[{"bool":{"must":[{"query_string":{"fields":["*"],"query":"heart("}}]}}]}},"highlight":{"pre_tags":["<mark>"],"post_tags":["</mark>"],"fields":{}},"size":0,"_source":{"includes":["*"],"excludes":[]},"from":0,"aggs":{"Modality.raw":{"terms":{"field":"Modality.raw","size":20,"order":{"_count":"desc"}}}}}
{"preference":"bodypart-list"}
{"query":{"bool":{"must":[{"bool":{"must":[{"query_string":{"fields":["*"],"query":"heart("}}]}}]}},"highlight":{"pre_tags":["<mark>"],"post_tags":["</mark>"],"fields":{}},"size":0,"_source":{"includes":["*"],"excludes":[]},"from":0,"aggs":{"BodyPartExamined.raw":{"terms":{"field":"BodyPartExamined.raw","size":100,"order":{"_count":"desc"}}}}}
{"preference":"gender-list"}
{"query":{"bool":{"must":[{"bool":{"must":[{"query_string":{"fields":["*"],"query":"heart("}}]}}]}},"highlight":{"pre_tags":["<mark>"],"post_tags":["</mark>"],"fields":{}},"size":0,"_source":{"includes":["*"],"excludes":[]},"from":0,"aggs":{"PatientSex.raw":{"terms":{"field":"PatientSex.raw","size":20,"order":{"_count":"desc"}}}}}
{"preference":"tagCloud"}
{"query":{"bool":{"must":[{"bool":{"must":[{"query_string":{"fields":["*"],"query":"heart("}}]}}]}},"highlight":{"pre_tags":["<mark>"],"post_tags":["</mark>"],"fields":{}},"size":0,"_source":{"includes":["*"],"excludes":[]},"from":0,"aggs":{"descriptions.raw":{"terms":{"field":"descriptions.raw","size":200,"order":{"_term":"asc"}}}}}
{"preference":"results"}
{"query":{"bool":{"must":[{"bool":{"must":[{"query_string":{"fields":["*"],"query":"heart("}}]}}]}},"highlight":{"pre_tags":["<mark>"],"post_tags":["</mark>"],"fields":{}},"size":12,"_source":{"includes":["*"],"excludes":[]},"from":0}

Full 200 response:

access-control-allow-credentials: true
access-control-allow-origin: *
content-encoding: gzip
content-length: 538
content-type: application/json; charset=UTF-8
Warning: 299 Elasticsearch-6.7.1-2f32220 "Deprecated aggregation order key [_term] used, replaced by [_key]"

{"responses":[{"error":{"root_cause":[{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image"}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":[{"shard":0,"index":"image","node":"X6uClAg5SimP2fxx3L872g","reason":{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image","caused_by":{"type":"parse_exception","reason":"Cannot parse 'heart(': Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    ","caused_by":{"type":"parse_exception","reason":"Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    "}}}}]},"status":400},{"error":{"root_cause":[{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image"}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":[{"shard":0,"index":"image","node":"X6uClAg5SimP2fxx3L872g","reason":{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image","caused_by":{"type":"parse_exception","reason":"Cannot parse 'heart(': Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    ","caused_by":{"type":"parse_exception","reason":"Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    "}}}}]},"status":400},{"error":{"root_cause":[{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image"}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":[{"shard":0,"index":"image","node":"X6uClAg5SimP2fxx3L872g","reason":{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image","caused_by":{"type":"parse_exception","reason":"Cannot parse 'heart(': Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    ","caused_by":{"type":"parse_exception","reason":"Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    "}}}}]},"status":400},{"error":{"root_cause":[{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image"}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":[{"shard":0,"index":"image","node":"X6uClAg5SimP2fxx3L872g","reason":{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image","caused_by":{"type":"parse_exception","reason":"Cannot parse 'heart(': Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    ","caused_by":{"type":"parse_exception","reason":"Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    "}}}}]},"status":400},{"error":{"root_cause":[{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image"}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":[{"shard":0,"index":"image","node":"X6uClAg5SimP2fxx3L872g","reason":{"type":"query_shard_exception","reason":"Failed to parse query [heart(]","index_uuid":"FqZfR415QIuajKOY32gXYg","index":"image","caused_by":{"type":"parse_exception","reason":"Cannot parse 'heart(': Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    ","caused_by":{"type":"parse_exception","reason":"Encountered \"<EOF>\" at line 1, column 6.\nWas expecting one of:\n    <NOT> ...\n    \"+\" ...\n    \"-\" ...\n    <BAREOPER> ...\n    \"(\" ...\n    \"*\" ...\n    <QUOTED> ...\n    <TERM> ...\n    <PREFIXTERM> ...\n    <WILDTERM> ...\n    <REGEXPTERM> ...\n    \"[\" ...\n    \"{\" ...\n    <NUMBER> ...\n    <TERM> ...\n    "}}}}]},"status":400}]}

I receive response 200 with even though the body is a clear error 😢. How can we make the 200 response be the 400 or 500 error that it should (and conform to standard HTTP practice)? Many thanks! This is a major blocker for me. It's causing havoc in my app because errors are silent and that's the worst kind of error!

Standards say that 200 means "the response will contain an entity corresponding to the requested resource" and ElasticSearch is not behaving that way.