can't figure our error 400 for elasticsearch query

I'm just trying to use elastic search and I ran this query:

curl -XPOST "http://host/logstash-2016.05.19/_search" -d'

{
  "query": {
        { "match": { "serviceName": "systemA" } }
  }
}'

but keep getting this error:

{
   "error": "SearchPhaseExecutionException[Failed to execute phase [query], all shards failed; shardFailures {[hTYqYg0RSt2XZrYWxwMQ3g][logstash-2016.05.19][0]: RemoteTransportException[[es1][inet[/10.149.76.25:9300]][indices:data/read/search[phase/query]]]; nested: SearchParseException[[logstash-2016.05.19][0]: from[-1],size[-1]: Parse Failure [Failed to parse source [{n  "query": {n        { "match": { "serviceName": "bsHolds" } }n  }n}n]]]; nested: QueryParsingException[[logstash-2016.05.19] Failed to parse]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field namen at [Source: UNKNOWN; line: 3, column: 10]]; }{[asrIxDjBSJeKvDTT7zfgMQ][logstash-2016.05.19][1]: RemoteTransportException[[es5][inet[/10.149.76.155:9300]][indices:data/read/search[phase/query]]]; nested: SearchParseException[[logstash-2016.05.19][1]: from[-1],size[-1]: Parse Failure [Failed to parse source [{n  "query": {n        { "match": { "serviceName": "bsHolds" } }n  }n}n]]]; nested: QueryParsingException[[logstash-2016.05.19] Failed to parse]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field namen at [Source: UNKNOWN; line: 3, column: 10]]; }{[asrIxDjBSJeKvDTT7zfgMQ][logstash-2016.05.19][2]: RemoteTransportException[[es5][inet[/10.149.76.155:9300]][indices:data/read/search[phase/query]]]; nested: SearchParseException[[logstash-2016.05.19][2]: from[-1],size[-1]: Parse Failure [Failed to parse source [{n  "query": {n        { "match": { "serviceName": "bsHolds" } }n  }n}n]]]; nested: QueryParsingException[[logstash-2016.05.19] Failed to parse]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field namen at [Source: UNKNOWN; line: 3, column: 10]]; }{[PwDi_CIiQHmOHp34KdWk0A][logstash-2016.05.19][3]: RemoteTransportException[[es3][inet[/10.149.76.97:9300]][indices:data/read/search[phase/query]]]; nested: SearchParseException[[logstash-2016.05.19][3]: from[-1],size[-1]: Parse Failure [Failed to parse source [{n  "query": {n        { "match": { "serviceName": "bsHolds" } }n  }n}n]]]; nested: QueryParsingException[[logstash-2016.05.19] Failed to parse]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field namen at [Source: UNKNOWN; line: 3, column: 10]]; }{[PwDi_CIiQHmOHp34KdWk0A][logstash-2016.05.19][4]: RemoteTransportException[[es3][inet[/10.149.76.97:9300]][indices:data/read/search[phase/query]]]; nested: SearchParseException[[logstash-2016.05.19][4]: from[-1],size[-1]: Parse Failure [Failed to parse source [{n  "query": {n        { "match": { "serviceName": "bsHolds" } }n  }n}n]]]; nested: QueryParsingException[[logstash-2016.05.19] Failed to parse]; nested: JsonParseException[Unexpected character ('{' (code 123)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field namen at [Source: UNKNOWN; line: 3, column: 10]]; }]",
   "status": 400
}

not sure what it means but I'm trying to follow the guides on elastic.co but I keep getting that 400 error on any query...