public Parser getFieldDiscoveryParser() {
    List<JSONPathFieldSpec> fields = new ArrayList<>();
    JSONPathSpec flattenSpec = new JSONPathSpec(true, fields);

    JSONParseSpec spec =
        new JSONParseSpec(
            new TimestampSpec("ts", "iso", null),
            new DimensionsSpec(null, null, null),
            flattenSpec,
            null);

    return spec.makeParser();
  }
  public Parser getForcedPathParser() {
    List<JSONPathFieldSpec> fields = new ArrayList<>();
    fields.add(JSONPathFieldSpec.createNestedField("ts", "$['ts']"));

    fields.add(JSONPathFieldSpec.createNestedField("d1", "$['d1']"));
    fields.add(JSONPathFieldSpec.createNestedField("d2", "$['d2']"));
    fields.add(JSONPathFieldSpec.createNestedField("e1.d1", "$['e1.d1']"));
    fields.add(JSONPathFieldSpec.createNestedField("e1.d2", "$['e1.d2']"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.d3", "$['e2.d3']"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.d4", "$['e2.d4']"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.d5", "$['e2.d5']"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.d6", "$['e2.d6']"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.ad1[0]", "$['e2.ad1[0]']"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.ad1[1]", "$['e2.ad1[1]']"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.ad1[2]", "$['e2.ad1[2]']"));
    fields.add(JSONPathFieldSpec.createNestedField("ae1[0].d1", "$['ae1[0].d1']"));
    fields.add(JSONPathFieldSpec.createNestedField("ae1[1].d1", "$['ae1[1].d1']"));
    fields.add(JSONPathFieldSpec.createNestedField("ae1[2].e1.d2", "$['ae1[2].e1.d2']"));

    fields.add(JSONPathFieldSpec.createNestedField("m3", "$['m3']"));
    fields.add(JSONPathFieldSpec.createNestedField("m4", "$['m4']"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.m1", "$['e3.m1']"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.m2", "$['e3.m2']"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.m3", "$['e3.m3']"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.m4", "$['e3.m4']"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.am1[0]", "$['e3.am1[0]']"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.am1[1]", "$['e3.am1[1]']"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.am1[2]", "$['e3.am1[2]']"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.am1[3]", "$['e3.am1[3]']"));
    fields.add(JSONPathFieldSpec.createNestedField("e4.e4.m4", "$['e4.e4.m4']"));

    JSONPathSpec flattenSpec = new JSONPathSpec(false, fields);
    JSONParseSpec spec =
        new JSONParseSpec(
            new TimestampSpec("ts", "iso", null),
            new DimensionsSpec(null, null, null),
            flattenSpec,
            null);

    return spec.makeParser();
  }
  public Parser getNestedParser() {
    List<JSONPathFieldSpec> fields = new ArrayList<>();
    fields.add(JSONPathFieldSpec.createRootField("ts"));

    fields.add(JSONPathFieldSpec.createRootField("d1"));
    // fields.add(JSONPathFieldSpec.createRootField("d2"));
    fields.add(JSONPathFieldSpec.createNestedField("e1.d1", "$.e1.d1"));
    fields.add(JSONPathFieldSpec.createNestedField("e1.d2", "$.e1.d2"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.d3", "$.e2.d3"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.d4", "$.e2.d4"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.d5", "$.e2.d5"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.d6", "$.e2.d6"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.ad1[0]", "$.e2.ad1[0]"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.ad1[1]", "$.e2.ad1[1]"));
    fields.add(JSONPathFieldSpec.createNestedField("e2.ad1[2]", "$.e2.ad1[2]"));
    fields.add(JSONPathFieldSpec.createNestedField("ae1[0].d1", "$.ae1[0].d1"));
    fields.add(JSONPathFieldSpec.createNestedField("ae1[1].d1", "$.ae1[1].d1"));
    fields.add(JSONPathFieldSpec.createNestedField("ae1[2].e1.d2", "$.ae1[2].e1.d2"));

    fields.add(JSONPathFieldSpec.createRootField("m3"));
    // fields.add(JSONPathFieldSpec.createRootField("m4"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.m1", "$.e3.m1"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.m2", "$.e3.m2"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.m3", "$.e3.m3"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.m4", "$.e3.m4"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.am1[0]", "$.e3.am1[0]"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.am1[1]", "$.e3.am1[1]"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.am1[2]", "$.e3.am1[2]"));
    fields.add(JSONPathFieldSpec.createNestedField("e3.am1[3]", "$.e3.am1[3]"));
    fields.add(JSONPathFieldSpec.createNestedField("e4.e4.m4", "$.e4.e4.m4"));

    JSONPathSpec flattenSpec = new JSONPathSpec(true, fields);
    JSONParseSpec spec =
        new JSONParseSpec(
            new TimestampSpec("ts", "iso", null),
            new DimensionsSpec(null, null, null),
            flattenSpec,
            null);

    return spec.makeParser();
  }
 public Parser getFlatParser() {
   JSONParseSpec spec =
       new JSONParseSpec(
           new TimestampSpec("ts", "iso", null), new DimensionsSpec(null, null, null), null, null);
   return spec.makeParser();
 }